Head-up display
A head-up display that comprises a light source, a display element, at least one mirror, a photodiode and a mirror element. The at least one mirror has a mirror surface that has a hole in at least one location, and the photodiode is arranged in the beam path of the light that passes through the hole.
1. A head-up display comprising:
a light source;
a display element;
at least one mirror having a mirror surface which defines a hole in at least one location;
a mirror element;
an illumination homogenization element arranged between the light source and the mirror; and
a photodiode arranged in the beam path of light coming from the light source and passing through the hole; and
wherein the hole is a bore in a substrate that carries the mirror surface and the bore has a cross-section that changes in the direction of the bore.
2. The head-up display as claimed in claim 1 , wherein the bore is mirror-coated in at least its region that is proximate to the mirror surface.
3. The head-up display as claimed in claim 1 , wherein the hole is formed in a location in the mirror surface that is not mirror-coated.
4. The head-up display as claimed in claim 1 , wherein the mirror is arranged in the beam path of the light coming from the light source following an illumination homogenization element.
5. A head-up display comprising:
a light source;
a display element;
at least one mirror having a mirror surface which defines a hole in at least one location;
a mirror element;
an illumination homogenization element arranged between the light source and the mirror; and
a photodiode arranged in the beam path of light coming from the light source and passing through the hole, wherein the hole is formed by a reflection element lying outside the mirror surface.
6. The head-up display as claimed in claim 5 , wherein the mirror is arranged in the beam path of the light coming from the light source following an illumination homogenization element.