Head up display lens
AssigneeBAE SYSTEMS plc
InventorsLeslie Charles Laycock, Christopher Stace, Ferhat Culfaz
Life of this patent
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Abstract
The following invention relates to an improved lens apparatus for use in a head up display (HUD), particularly for providing HUD with a depth of field and more particularly with providing a secondary virtual image in a different colour so as to provide a warning message. The partially reflecting combiner has a first surface S1 located closest to a display, and a second surface S2, located furthest from the display, wherein the effective radius of curvature of surface S2>S1, so as to provide two non-coincident virtual images. The selection of antireflective coatings on the surfaces S2 and S1 allows the non-coincident virtual images to have different coloured virtual images.
Claims20
A display device for vehicles comprising:
- a display which provides system information that is to be displayed to a user;
- and
- a partially reflecting combiner, which magnifies the system information from the display, and provides a virtual image of said display;
- wherein said partially reflecting combiner has a first curved surface S1 and a second curved surface S2, the first curved surface S1 being closer to the display than the second curved surface S2, wherein the radii of curvature of surface S2>S1, so as to provide two non-coincident virtual images.
A display device comprising:
- a display which provides information that is to be displayed to a user;
- and
- a partially reflecting combiner configured to magnify the system information from the display, said partially reflecting combiner having a first curved surface S1 and a second curved surface S2, the first curved surface S1 being closer to the display than the second curved surface S2, wherein the radii of curvature of surface S2>S1, so as to provide two non-coincident virtual images, the images including a primary virtual image and a secondary virtual image.
Dependencies are inferred from the claim text.