Abstract: Examples are disclosed that relate to head-mounted display (HMD) devices and methods for detecting light reflected by a user's eye. In one example, an HMD device comprises a frame, a transparent cover substrate supported by the frame, and a display substrate supported by the frame. An eye-tracking light source is affixed to the frame. The eye-tracking light source is configured to emit eye-tracking light. At least one input optical element is configured to receive the eye-tracking light. A plurality of transparent delivery waveguides are integrated with the transparent cover substrate. Each of the transparent delivery waveguides comprises an output optical element configured to output the eye-tracking light towards a user's eye. In addition, each of the transparent delivery waveguides comprises a curved portion. The HMD device further comprises a camera configured to detect the eye-tracking light reflected by the user's eye.

Abstract: The description relate to devices, such as augmented reality and/or virtual reality devices that employ optical waveguides. On example includes a first optical waveguide configured to receive light at an incidence angle and a second optical waveguide positioned in a non-parallel relation to the first optical waveguide. The second optical waveguide can be configured to receive the light through the first optical waveguide at a first location at the incidence angle, transmit the light within the second optical waveguide, and output the light from a second location back toward the first optical waveguide at the incidence angle.

Abstract: The description relate to devices, such as augmented reality and/or virtual reality devices that employ optical waveguides. On example includes a first optical waveguide configured to receive light at an incidence angle and a second optical waveguide positioned in a non-parallel relation to the first optical waveguide. The second optical waveguide can be configured to receive the light through the first optical waveguide at a first location at the incidence angle, transmit the light within the second optical waveguide, and output the light from a second location back toward the first optical waveguide at the incidence angle.