Head-mounted display apparatus employing one or more Fresnel lenses
First Claim
1. A direct view head-mounted display apparatus comprising:
- a frame adapted to be mounted on a head of a nominal user, the frame configured to position an image display system in front of an eye of the nominal user; and
a Fresnel lens system supported by the frame and positioned between the image display system and the eye of the nominal user, the Fresnel lens system configured to project images from the image display system onto a wider field of view for the nominal user than a field of view physically occupied by the image display system, the Fresnel lens system comprising;
a first curved Fresnel lens that is symmetrical about an axis that extends perpendicularly from a center point of the first curved Fresnel lens, wherein the first curved Fresnel lens is curved along two dimensions and has a spherical shape; and
a second curved Fresnel lens that is symmetrical about an axis that extends perpendicularly from a center point of the second curved Fresnel lens, wherein the second curved Fresnel lens is curved along two dimensions and has a spherical shape, and wherein the first curved Fresnel lens and the second curved Fresnel lens are positioned in a stacked relationship wherein light emitted from the image display system passes through the first curved Fresnel lens and the second curved Fresnel lens;
and wherein a light path from the image display system to the eye of the nominal user is devoid of any reflective optical elements.
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Abstract
Head-mounted displays (100) are disclosed which include a frame (107), an image display system (110) supported by the frame (107), and a Fresnel lens system (115) supported by the frame (107). The HMD (100) can employ a reflective optical surface, e.g., a free-space, ultra-wide angle, reflective optical surface (a FS/UWA/RO surface) (120), supported by the frame (107), with the Fresnel lens system (115) being located between the image display system (110) and the reflective optical surface (120). The Fresnel lens system (115) can include at least one curved Fresnel lens element (820). Fresnel lens elements (30) for use in HMDs are also disclosed which have facets (31) separated by edges (32) which lie along radial lines (33) which during use of the HMD pass through a center of rotation (34) of a nominal user'"'"'s eye (35) or through the center of the eye'"'"'s lens (36) or are normal to the surface of the eye'"'"'s cornea.
236 Citations
17 Claims
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1. A direct view head-mounted display apparatus comprising:
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a frame adapted to be mounted on a head of a nominal user, the frame configured to position an image display system in front of an eye of the nominal user; and a Fresnel lens system supported by the frame and positioned between the image display system and the eye of the nominal user, the Fresnel lens system configured to project images from the image display system onto a wider field of view for the nominal user than a field of view physically occupied by the image display system, the Fresnel lens system comprising; a first curved Fresnel lens that is symmetrical about an axis that extends perpendicularly from a center point of the first curved Fresnel lens, wherein the first curved Fresnel lens is curved along two dimensions and has a spherical shape; and a second curved Fresnel lens that is symmetrical about an axis that extends perpendicularly from a center point of the second curved Fresnel lens, wherein the second curved Fresnel lens is curved along two dimensions and has a spherical shape, and wherein the first curved Fresnel lens and the second curved Fresnel lens are positioned in a stacked relationship wherein light emitted from the image display system passes through the first curved Fresnel lens and the second curved Fresnel lens; and wherein a light path from the image display system to the eye of the nominal user is devoid of any reflective optical elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification