Abstract: A method includes displaying a high contrast image on a display screen; and projecting the high contrast image through a Fresnel lens to provide a cue for adjusting a position of the Fresnel lens. Also disclosed is a device for determining and/or adjusting an offset of a Fresnel lens. The device includes a Fresnel lens and a display screen configured to project a high contrast image through the Fresnel lens. Further disclosed is a method for adjusting a position of a Fresnel lens. The method includes receiving a projection of a high contrast image transmitted through a Fresnel lens; and adjusting a position of the Fresnel lens based on the projection of the high contrast image.

Abstract: A lens defined by a first lens surface and a second lens surface opposite to the first lens surface is disclosed. The lens includes a first portion; and a second portion that is distinct from the first portion and is located around the first portion. The first lens surface for the first portion of the lens is defined by a Fresnel surface profile. The second lens surface for the first portion of the lens is defined by a smooth surface profile. The first lens surface for a second portion of the lens is defined by a Fresnel surface profile. The second lens surface for the second portion of the lens is defined by a Fresnel surface profile.

Abstract: A lens defined by a first lens surface and a second lens surface opposite to the first lens surface is disclosed. A first portion of the first lens surface is defined by a smooth surface profile function, and a second portion of the first lens surface is defined by a Fresnel surface profile function. The second portion of the first lens surface is around the first portion of the first lens surface. Also disclosed is a display device that includes the lens and an array of light emitting devices coupled with the lens for outputting light through the lens.

Abstract: A lens includes an optically transparent substrate having a first lens surface and a second lens surface opposite to the first lens surface. The first lens surface includes a plurality of Fresnel structures. A respective Fresnel structure of the plurality of Fresnel structures includes a slope facet and a draft facet. The draft facet is characterized by a draft angle. The draft angle of the respective Fresnel structure is based on a distance of the respective Fresnel structure from a center of the lens.

Abstract: A lens includes an optically transparent substrate having a first lens surface and a second lens surface opposite to the first lens surface. The first lens surface includes a plurality of Fresnel structures. A respective Fresnel structure of the plurality of Fresnel structures includes a slope facet and a draft facet. The draft facet is characterized by a draft angle. The draft angle of the respective Fresnel structure is based on a distance of the respective Fresnel structure from a center of the lens.

Abstract: A lens defined by a first lens surface and a second lens surface opposite to the first lens surface is disclosed. A first portion of the first lens surface is defined by a smooth surface profile function, and a second portion of the first lens surface is defined by a Fresnel surface profile function. The second portion of the first lens surface is around the first portion of the first lens surface. Also disclosed is a display device that includes the lens and an array of light emitting devices coupled with the lens for outputting light through the lens.

Abstract: A lens defined by a first lens surface and a second lens surface opposite to the first lens surface is disclosed. The lens includes a first portion; and a second portion that is distinct from the first portion and is located around the first portion. The first lens surface for the first portion of the lens is defined by a Fresnel surface profile. The second lens surface for the first portion of the lens is defined by a smooth surface profile. The first lens surface for a second portion of the lens is defined by a Fresnel surface profile. The second lens surface for the second portion of the lens is defined by a Fresnel surface profile.