US 12,078,801 B2
Image projection
Jamieson Christmas, Milton Keynes (GB); Máté Karner, Milton Keynes (GB); Ruisheng Lin, Milton Keynes (GB); and Timothy Smeeton, Milton Keynes (GB)
Assigned to Envisics Ltd, Milton Keynes (GB)
Filed by ENVISICS LTD, Milton Keynes (GB)
Filed on Jan. 28, 2022, as Appl. No. 17/587,327.
Claims priority of application No. 2101666 (GB), filed on Feb. 5, 2021.
Prior Publication US 2022/0252879 A1, Aug. 11, 2022
Int. Cl. G03H 1/08 (2006.01); G02B 27/00 (2006.01); G02B 27/01 (2006.01); G03H 1/16 (2006.01); G03H 1/22 (2006.01)
CPC G02B 27/0103 (2013.01) [G02B 27/0081 (2013.01); G03H 1/0808 (2013.01); G03H 1/16 (2013.01); G03H 1/2294 (2013.01); G02B 2027/0105 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of determining a hologram for display on a display device arranged to propagate spatially-modulated light to a viewing system, the method comprising:
(i) determining the location of an entrance pupil of the viewing system arranged to receive spatially-modulated light from the display device, the display device being arranged to propagate the spatially-modulated light to the viewing system through a waveguide pupil expander that is arranged to receive the spatially-modulated light from the display device and provide a plurality of different light propagation paths for the spatially-modulated light from the display device to the viewing system;
(ii) identifying at least one contributory area of the display device and at least one non-contributory area of the display device, wherein
each contributory area of the display device is an area of the display device from which light propagating from the display device through the waveguide pupil expander pass through the entrance pupil of the viewing system at the determined location,
each non-contributory area of the display device is an area of the display device from which light propagating from the display device through the waveguide pupil expander do not pass through the entrance pupil of the viewing system at the determined location;
(iii-a) identifying at least one primary contributory area of the display device that provides spatially modulated light contributing to a primary image received through the entrance pupil;
(iii-b) identifying at least one secondary contributory area of the display device that provides spatially modulated light contributing to a secondary image received through the entrance pupil, the secondary image being a lower-intensity replica of the primary image; and
(iv) determining the hologram based on the at least one primary contributory area of the display device.