Head-up display system

Patent metadata

Field	Value
Publication number	US-10914946-B2
Application number	US-201715777647-A
Country	US
Kind code	B2
Filing date	Mar 20, 2017
Priority date	May 17, 2016
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A head-up display system with an imaging unit for generating an image on a projection surface is described. The projection surface is provided for reflecting at least a part of the image. The projection surface includes a transparent screen having a transparent substrate and at least one electrically conductive coating with at least one functional layer on at least one surface of the transparent substrate.

First claim

The invention claimed is:

1. A head-up display system comprising:
an imaging unit for generating an image on a projection surface, the imaging unit constructed and arranged to emit s-polarized light,

wherein the projection surface is provided for reflecting at least a part of the image,
wherein the projection surface comprises a transparent pane having a transparent substrate and at least one electrically conductive coating with at least one functional layer on at least one surface of the transparent substrate,
wherein each functional layer comprises
a layer of optically highly refractive material with a refractive index ≥1.3,
above the layer of optically highly refractive material, a first matching layer,
above the first matching layer, an electrically conductive layer,
above the electrically conductive layer, a second matching layer, and

wherein the composite pane is constructed and arranged to reflect more s-polarized light than p-polarized light into a field of view of a driver of a vehicle in which the head-up display is equipped.

2. The head-up display system according to claim 1 , wherein the electrically conductive coating has at least four functional layers arranged one atop another wherein each functional layer includes at least one electrically conductive layer containing at least silver or a silver-containing alloy.

3. The head-up display system according to claim 2 , wherein each electrically conductive layer has the same layer thickness.

4. The head-up display system according to claim 2 , wherein one electrically conductive layer has a layer thickness that is half as thick as the layer thickness of a second electrically conductive layer.

5. The head-up display system according to claim 1 , wherein the transparent substrate is joined to a second pane via at least one thermoplastic intermediate layer to form a composite pane.

6. The head-up display system according to claim 4 , wherein the composite pane is provided for reflecting s-polarized light.

7. The head-up display system according to claim 6 , wherein at least one layer of optically highly refractive material arranged between two electrically conductive layers comprises
a layer of a dielectric material with a refractive index less than or equal to 2.1, and
a layer of optically highly refractive material with a refractive index greater than or equal to 2.1.

8. The head-up display system according to claim 1 , wherein the layer of optically highly refractive material includes at least silicon nitride.

9. The head-up display system according to claim 1 , wherein the layer of optically highly refractive material arranged between two electrically conductive layers includes mixed silicon/zirconium nitride.

10. A motor vehicle, comprising: a head-up display system according to claim 1 .

11. A method for generating an image on a projection surface, comprising:
providing a head-up display system according to claim 1 ; and
using the head-up display system as the projection surface.

12. A method, comprising:
providing the head-up display system according to claim 1 ; and using the head-up display system in a vehicle.

13. The method of claim 12 , wherein the vehicle is a motor vehicle.

14. The head-up display system according to claim 2 , wherein each electrically conductive layer contains between 20% and 30% silver.

Assignees

• Saint Gobain

Inventors

• Fischer Klaus
• Kuehne Matthias
• Hornschuh Sandra
• Zimmermann Roberto
• Henseler Martin
• Schaefer Dagmar
• Jansen Michael

Classifications

• B60K35/60

  Instruments characterised by their location or relative disposition in or on vehicles (arrangements of lighting devices on dashboards B60Q3/10) · CPC title

• B60K35/23

  Head-up displays [HUD] (optical aspects of head-up displays G02B27/01) · CPC title

• B32B17/10036 Primary

  comprising two outer glass sheets · CPC title

• C03C17/3673

  specially adapted for use in heating devices for rear window of vehicles · CPC title

• B32B17/10229

  Metallic layers sandwiched by dielectric layers · CPC title