US 11,947,127 B2
Head-up display
Mate Karner, Milton Keynes (GB); and Jamieson Christmas, Milton Keynes (GB)
Assigned to Envisics Ltd, Milton Keynes (GB)
Filed by ENVISICS LTD, Milton Keynes (GB)
Filed on Apr. 15, 2022, as Appl. No. 17/721,836.
Application 17/721,836 is a continuation of application No. 17/059,935, granted, now 11,307,425, previously published as PCT/EP2019/072516, filed on Aug. 22, 2019.
Claims priority of application No. 1814053 (GB), filed on Aug. 29, 2018.
Prior Publication US 2022/0244550 A1, Aug. 4, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/01 (2006.01); B60K 35/00 (2006.01); B60K 35/23 (2024.01)
CPC G02B 27/0179 (2013.01) [B60K 35/00 (2013.01); G02B 27/0101 (2013.01); B60K 35/23 (2024.01); G02B 27/0103 (2013.01); G02B 2027/0105 (2013.01); G02B 2027/0109 (2013.01); G02B 2027/0127 (2013.01); G02B 2027/014 (2013.01); G02B 2027/0145 (2013.01); G02B 2027/0185 (2013.01); G02B 2027/0196 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A head-up display for a vehicle having a window, the head-up display comprising:
a picture generating unit arranged to output pictures, wherein each picture comprises a first picture component and a second picture component;
a projection engine arranged to receive the pictures output by the picture generating unit and project the pictures onto the window of the vehicle in order to form a first virtual image of the first picture component at a first virtual image distance from a viewing plane and a second virtual image of the second picture component at a second virtual image distance from the viewing plane, wherein the first virtual image distance is substantially different from the second virtual image distance, and wherein light of the first picture component is polarised in a first polarisation direction and light of the second picture component is polarised in a second polarisation direction perpendicular to the first polarisation direction,
wherein the projection engine comprises
a first polarisation-selective reflective surface arranged to receive light of the first picture component and light of the second picture component and to reflect the light of the first picture component a first optical power and to transmit the light of the second picture component; and
a second reflective surface arranged to receive light of the second picture component transmitted by the first polarization-selective mirror and to reflect the light of the second picture component transmitted by the first polarization-selective mirror with a second optical power,
the first optical power being substantially different than the second optical power.