Patent ID: 11970060
Assignee: VOLKSWAGEN AKTIENGESELLSCHAFT
Field: Optics (Instruments)
Classification: CPC B  G | IPC B  G

Claim 10:
11. A method of operating a head-up display, comprising:
projecting, via an optical system, an image for a projection surface, wherein the optical system comprises at least a first minor, a curved second minor arranged adjacent to the first minor, and a selectively reflective element configured in an optical path between the first mirror and the second mirror, wherein the reflective element comprises a direction-selective reflector configured to reflect light for a first range of angles, and configured to be transparent for a second range of angles;
directing, via the optical system, emitted light from the image to pass through the selectively reflective element;
reflecting, via the optical system, the emitted light from the image off the first minor towards the selectively reflective element;
reflecting, via the optical system, the emitted light from the image by the selectively reflective element towards the second mirror; and
reflecting, via the optical system, emitted light from the image by the second mirror towards the selectively reflective element, and passing the emitted light through the selectively reflective element to be directed to the projection surface.