US 12,013,528 B1
Optimised tracking camera positioning in display devices
Evgeny Shirko, Helsinki (FI); and Juahn Cho, Helsinki (FI)
Assigned to Varjo Technologies Oy, Helsinki (FI)
Filed by Varjo Technologies Oy, Helsinki (FI)
Filed on Jul. 24, 2023, as Appl. No. 18/357,567.
Int. Cl. G02B 27/00 (2006.01); G02B 27/01 (2006.01); G06T 17/20 (2006.01)
CPC G02B 27/0093 (2013.01) [G02B 27/0172 (2013.01); G06T 17/20 (2013.01); G02B 2027/0138 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A tracking system for use in a display device, the display device comprising an eye piece per eye, the tracking system comprising:
a plurality of illuminators per eye, arranged along a periphery of the eye piece; and
a first camera per eye, arranged at the periphery of the eye piece, wherein a line passing through the first camera and an optical centre of the eye piece forms a first angle lying in a range of 0 degree to 40 degrees with respect to a horizon plane, wherein an optical axis of the eye piece and an inter-optical horizon line lie on the horizon plane, the inter-optical horizon line passing through optical centres of both eye pieces of the display device, the first camera being positioned below the horizon plane.