US 12,449,767 B2
Hologram calculation
Timothy Smeeton, Milton Keynes (GB); Jamieson Christmas, Milton Keynes (GB); Daniel Burnham, Milton Keynes (GB); Ruisheng Lin, Milton Keynes (GB); and Gavin Fowler, Milton Keynes (GB)
Assigned to Envisics Ltd., Milton Keynes (GB)
Filed by Envisics Ltd, Milton Keynes (GB)
Filed on Jul. 7, 2022, as Appl. No. 17/859,413.
Claims priority of application No. 2112216 (GB), filed on Aug. 26, 2021.
Prior Publication US 2023/0060564 A1, Mar. 2, 2023
Int. Cl. G03H 1/26 (2006.01)
CPC G03H 1/26 (2013.01) [G03H 2001/262 (2013.01); G03H 2222/13 (2013.01); G03H 2223/16 (2013.01); G03H 2226/02 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of reconstructing an image from a hologram, the method comprising:
receiving the image for display within a display area of a display system, wherein the display area is viewable from a viewing area spatially separated therefrom;
determining a first image component of the image;
calculating an angularly-channelized hologram of the image, wherein when illuminated, the angularly-channelized hologram produces spatially modulated light divided into a plurality of hologram channels, and wherein each hologram channel is defined by a range of light ray angles corresponding to a respective continuous region of the image;
displaying the angularly-channelized hologram on a display device and spatially modulating light in accordance with the displayed angularly-channelized hologram; and
propagating the spatially modulated light through a pupil expander arranged to provide a plurality of different light propagation paths for the spatially modulated light from the display device to the viewing area, wherein each light propagation path corresponds to a respective continuous region of the image based on the hologram channels produced by the angularly-channelized hologram;
wherein the method comprises allocating more data processing resources to calculation of the angularly-channelized hologram with respect to the first image component than a second image component of the image, and wherein the first image component corresponds to a first sub-area of the image within a foveal vision area of a viewer, and wherein and the second image component corresponds to a second sub-area of the image within a peripheral vision area of the viewer.