Projection arrangement for a head-up display (HUD) with p-polarised radiation

US11914144B2 · kind B2 · utility

Assignee

• SAINT-GOBAIN GLASS FRANCE · FR

Inventors

• Klaus Fischer · Augsburg, DE
• Dagmar Schaefer · Portland, US
• Roberto Zimmermann · Solingen, DE

Key dates

• Filing date: Oct 25, 2019
• Grant date: Feb 27, 2024
• Expiry date: Feb 10, 2041

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2027/0194
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A projection arrangement for a head-up display (HUD), includes a composite pane, including an outer and an inner pane connected to one another via a thermoplastic intermediate layer, with an HUD region; an electrically conductive coating on the surface of the outer pane or of the inner pane facing or within the intermediate layer; and a projector directed toward the HUD region. The radiation of the projector is p-polarised. The composite pane has reflectance of at least 10% relative to p-polarised radiation in the spectral range from 450 nm to 650 nm. The electrically conductive coating includes at least four electrically conductive layers, which are each arranged between two dielectric layers or layer sequences. The sum of the thicknesses of all electrically conductive layers is at most 30 nm and at least one of the electrically conductive layers has a thickness of at most 5 nm.