An electronic device may include a display module that generates image light and an optical system that redirects the image light towards an eye box. The optical system may include an input coupler on a waveguide and collimating optics that collimate the image light between the image light exiting a display module and the image light reaching the input coupler. The collimating optics may include a catadioptric lens that refracts the image light at least twice and reflects the image light at least twice. The catadioptric lens may include first and second lens elements with different refractive indices. The catadioptric lens may include first and second lens elements formed from the same material and attached using optically clear adhesive.

A head-up display is configured to project an image on a transparent reflection member to cause an observer to visually recognize a virtual image, and includes a display device configured to display the image, and a projection optical system configured to project the image displayed by the display device as the virtual image for the observer. The projection optical system is configured to form the image as an intermediate image, and includes a first optical element configured to condense light, a first lens configured to condense light, and a second optical element configured to diffuse light. The first optical element, the first lens, and the second optical element are disposed in this order along an optical path from the display device.