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US 8,842,368 B2Granted
Head mounted display
AssigneeBAE SYSTEMS plc
InventorsMichael David Simmonds, Mohmed Salim Valera
Life of this patent
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Abstract
A helmet or head-mounted apparatus has a visor or other curved optical element in front of at least one eye of a wearer, which element also is used as a waveguide. Image-bearing light is injected into the waveguide via an input diffractive element, and propagates through the visor to an output diffractive element which releases the light. The optical powers of the curved waveguide and the input and output diffractive elements are selected so that the released light is delivered as an image to the users eye.
Claims14
A head-mounted or helmet-mounted display apparatus comprising:
- an optical element which in use is disposed in front of an eye of a user and which is curved in both azimuth and elevation relative to the eye, the optical element comprises a waveguide portion;
- a source of image-bearing light;
- and
- diffraction means for propagation of image-bearing light through the optical element, the diffraction means also being arranged to release the image bearing light from the optical element along a curved section of the optical element, the optical element and the diffraction means having optical powers such that the released light provides a visible image to the user's eye, the diffraction means including grating lines including a curved diffractive component arranged to converge the image-bearing light exiting the optical element.
1 more element
Dependencies are inferred from the claim text.