US 12,447,721 B2
Projection assembly for a head-up display (HUD) with p-polarized radiation
Lisa Schmadtke, Würselen (DE); Stephan Gillessen, Alsdorf (DE); Jefferson Do Rosario, Aachen (DE); and Jan Hagen, Bonn (DE)
Assigned to SAINT-GOBAIN SEKURIT FRANCE, Thourotte (FR)
Appl. No. 18/252,106
Filed by SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
PCT Filed Jan. 10, 2022, PCT No. PCT/EP2022/050322
§ 371(c)(1), (2) Date May 8, 2023,
PCT Pub. No. WO2022/157021, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 21152651 (EP), filed on Jan. 21, 2021.
Prior Publication US 2024/0009967 A1, Jan. 11, 2024
Int. Cl. B32B 17/10 (2006.01)
CPC B32B 17/10229 (2013.01) [B32B 17/10036 (2013.01); B32B 17/1011 (2013.01); B32B 2307/202 (2013.01); B32B 2307/204 (2013.01); B32B 2307/402 (2013.01); B32B 2307/418 (2013.01); B32B 2307/7376 (2023.05)] 19 Claims
OG exemplary drawing
 
1. A projection assembly for a head-up display (HUD), comprising:
a windshield, comprising an outer pane and an inner pane that are joined to one another via a thermoplastic intermediate layer, having a HUD region; and
a projector that is directed at the HUD region and that is adapted to emit p-polarized radiation;
wherein
a reflection coating is arranged on a surface of the outer pane or of the inner pane facing the thermoplastic intermediate layer or within the thermoplastic intermediate layer, which reflection coating is suitable for reflecting p-polarized radiation and which has exactly one electrically conductive layer based on silver;
an emissivity-reducing coating is arranged on a surface of the inner pane facing away from the thermoplastic intermediate layer, which emissivity-reducing coating has an electrically conductive layer based on a transparent conductive oxide,
wherein the emissivity-reducing coating comprises
a blocking layer against alkali diffusion with a refractive index of at least 1.9,
above the blocking layer, a dielectric lower antireflection layer with a refractive index from 1.3 to 1.8,
above the dielectric lower antireflection layer, the electrically conductive layer,
above the electrically conductive layer, a dielectric barrier layer for regulating oxygen diffusion with a refractive index of at least 1.9, and
above the dielectric barrier layer, a dielectric upper antireflection layer with a refractive index from 1.3 to 1.8.