1262 results about "Exit pupil" patented technology

An illumination system comprises (a) a first optical element upon which a light beam impinges, where the first optical element has first raster elements that partition said light beam into light channels; (b) a second optical element that receives said light channels, where the second optical element has a second raster elements; (c) an object plane that receives said light channels via said second optical element; and (d) an exit pupil that is provided with an illumination via said object plane. The system is characterized by an assignment of a member of said first raster elements and a member of said second raster elements to each of said light channels to provide a continuous beam path from said first optical element to said object plane for each of said plurality of light channels. The assignment is changeable to provide an adjustment of said illumination in said exit pupil.

A diffractive beam expander (50) comprises an input grating (10), a crossed grating (20), and an output grating (30) implemented on a planar transparent substrate (7). The crossed grating (20) comprises a plurality of diffractive features (23) arranged along the lines of a first set of parallel lines (25) and along the lines of a second set of parallel lines (26) such that the lines (25) of the first set are parallel to the lines (26) of the second set. The lines of the first set have a first grating period and the lines of the second set have a second grating period. A light beam (B1) coupled into the substrate (7) by the input grating (10) impinges on the crossed grating (20) at a first location (EC1) and further locations (EC2). Interaction at the first location (EC1) provides several sub-beams (S00, S01, S10) which propagate in different directions. Further interactions at second locations (EC2) provide further sub-beams (V01, U10) which propagate in the same direction as the original in-coupled light (B1). Light is subsequently coupled out of the substrate (7) by the output grating (30) to provide a light beam (B2) which is expanded in two directions (SX, SZ) with respect to the beam (B0) impinging on the input grating. A virtual display device (200) may comprise said diffractive beam expander (50).

An exit pupil extender wherein the relative amount of different color components in the exit beam is more consistent with that of the input beam. In order to compensate for the uneven amount in the diffracted color components in the exit beam, the exit pupil extender, comprises a plurality of layers having additional diffraction gratings so as to increase the amount of diffracted light for those color components with a lower amount. Additionally, color filters disposed between layers to reduce the diffracted light components with a higher amount.

The specification and drawings present a new apparatus and method for providing a wide field-of-view as well as illumination uniformity in exit pupil expanders (EPE) using stacked EPE substrates (or plates) with non-symmetric exit pupil expansion that use a plurality of diffractive elements for expanding the exit pupil of a display for viewing.

An exit pupil extender with one input optical element and two exit optical elements disposed on different sides of the input optical element. The exit pupil extender also comprises two intermediate diffractive optical couplers, each disposed between the input optical element and one exit optical element. The couplers serve as exit pupil extending components. The grating lines of the couplers are at substantially a 60-degree angle from that of the optical elements in order to optimize the exit pupil extending efficiency. This invention further describes a general diffractive optics method that uses a plurality of diffractive elements on an optical substrate for expanding the exit pupil of a display of an electronic device for viewing. The system can support a broad range of rotations angles (e.g., 0<ρ<70°) and corresponding conical angles and remains geometrically accurate.

The specification and drawings present a new apparatus and method for using a three-dimensional (3D) diffractive element (e.g., a 3D diffractive grating) for expanding in one or two dimensions the exit pupil of an optical beam in electronic devices. Various embodiments of the present invention can be applied, but are not limited, to forming images in virtual reality displays, to illuminating of displays (e.g., backlight illumination in liquid crystal displays) or keyboards, etc.

There is provided an optical device, composed of a display source (4), an imaging optical module (8), a projection module (12) having a projection mechanism including an input aperture (10) and output aperture (14) defined by a surface area, and an exit pupil (16). The projection mechanism is non-uniform over the area of the output aperture (14).