	US 12,092,818 B2
	Projection assembly for a head-up display (HUD) with p-polarised radiation
Klaus Fischer, Alsdorf (DE); and Jan Hagen, Bonn (DE)
Assigned to SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
Appl. No. 17/437,344
Filed by SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
PCT Filed May 20, 2020, PCT No. PCT/EP2020/064022 § 371(c)(1), (2) Date Sep. 8, 2021, PCT Pub. No. WO2021/004685, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 19184617 (EP), filed on Jul. 5, 2019.
Prior Publication US 2022/0179208 A1, Jun. 9, 2022
Int. Cl. G02B 27/01 (2006.01); B32B 17/10 (2006.01); B32B 27/30 (2006.01); B60J 3/00 (2006.01); B60K 35/00 (2006.01); C03C 17/36 (2006.01); G02B 5/30 (2006.01); B60K 35/23 (2024.01)

CPC G02B 27/0101 (2013.01) [B32B 17/10036 (2013.01); B32B 17/10229 (2013.01); B32B 17/10458 (2013.01); B32B 17/10761 (2013.01); B32B 27/30 (2013.01); B60J 3/007 (2013.01); B60K 35/00 (2013.01); C03C 17/3618 (2013.01); C03C 17/3626 (2013.01); C03C 17/3644 (2013.01); C03C 17/366 (2013.01); C03C 17/3681 (2013.01); G02B 5/3041 (2013.01); B32B 2250/40 (2013.01); B32B 2255/205 (2013.01); B32B 2255/28 (2013.01); B32B 2307/202 (2013.01); B32B 2307/204 (2013.01); B32B 2307/412 (2013.01); B32B 2307/42 (2013.01); B32B 2315/08 (2013.01); B32B 2329/06 (2013.01); B32B 2551/00 (2013.01); B32B 2605/006 (2013.01); B32B 2605/08 (2013.01); B60K 35/23 (2024.01); C03C 2217/734 (2013.01)]

20 Claims

1. A projection assembly for a head-up display (HUD), comprising: a windshield, comprising an outer pane and an inner pane, which are joined to one another via a thermoplastic intermediate layer, and having an HUD region; and an HUD projector, which is directed at the HUD region; wherein a radiation of the HUD projector is predominantly p-polarised, and the windshield is provided with a reflective coating which is adapted to reflect p-polarised radiation; and wherein the reflective coating has exactly one electrically conductive layer, and arranged one above and one below the electrically conductive layer are two dielectric layer sequences, each comprising n low-optical-refraction layers having an index of refraction less than 1.8 and (n+1) high-optical-refraction layers having an index of refraction greater than 1.8, arranged alternatingly in each case, wherein n is an integer greater than or equal to 1.