Automatically dimmable rear-view mirror arrangement for motor vehicles and method for producing a mirror assembly for a rear-view mirror arrangement

• US 10,166,926 B2
• Filed: 10/16/2013
• Issued: 01/01/2019
• Est. Priority Date: 11/06/2012
• Status: Active Grant

• Current Assignee: Magna Mirrors Holding GmbH (Magna International Incorporated)
• Original Assignee: Magna Mirrors Holding GmbH (Magna International Incorporated)
• Inventors: Krebs, Peter, Fuchs, Hans-Joachim, March, Phillip
• Primary Examiner(s): Kim, Richard H
• Application Number:
  US14/440,485
• Publication Number:
  US 20150283945A1
• Time in Patent Office: 1,903 Days
• Field of Search: None
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: Y10T 29/49155 Manufacturing circuit on or in base

Abstract

A rear-view mirror arrangement for motor vehicles that includes a housing and a mirror assembly arranged thereon and which is to observe following traffic. The mirror assembly has a front side and a rear side, in which a reflectance thereof that it is variable by a control device. The mirror assembly has an electrically drivable liquid crystal cell arranged between transparent carrier layers, and at least one reflection coating. One of the transparent carrier layers which faces toward the housing on the rear side is an optically transparent plastic film that is provided with the reflection coating on the rear side.

Claims

1. A rear-view mirror arrangement for a motor vehicle, comprising:

a housing; and

a mirror assembly arranged on the housing for observing following traffic, and having;

a front transparent carrier layer composed of an optically transparent plastic film and a rear transparent carrier layer composed of an optically transparent plastic film, and which faces toward the housing on a rear side thereof,

at least one reflection coating provided directly on and contacting the rear transparent carrier layer, and

an electrically-drivable liquid crystal cell arranged between the front transparent carrier layer and the rear transparent carrier layer, and which has a liquid crystalline layer arranged in a sealed fashion between transparent electrically conductive layers via a seal layer arranged substantially coplanar and circumferential at an upper surface and a bottom surface thereof with respect to the liquid crystalline layer, and a transparent alignment layer provided directly on and contacting the liquid crystalline layer and the seal layer between a respective one of the transparent electrically conductive layers and the liquid crystalline layer to align liquid crystal molecules of the liquid crystalline layer in a ground state.

2. The rear-view mirror arrangement of claim 1, wherein the at least one reflection coating comprises a silver, aluminum or chromium material.

3. The rear-view mirror arrangement of claim 1, wherein the electrically conductive layers comprise an indium tin layer or indium tin oxide layer.

4. The rear-view mirror arrangement of claim 1, wherein the optically transparent film comprises polyethylene terephthalate, or polycarbonate, or polymethyl methacrylate.

5. The rear-view mirror arrangement of claim 1, wherein the reflection coating comprises a semi-transparent reflective coating.

6. The rear-view mirror arrangement of claim 5, further comprising a display arrangement arranged between a rear side of the mirror assembly and the housing.

7. The rear-view mirror arrangement of claim 1, further comprising an anti-corrosion protective layer as a terminating layer on the rear side of the rear-view mirror arrangement.

8. The rear-view mirror arrangement of claim 1, wherein a reflectance of the mirror assembly is variable by a control device.

9. A mirror arrangement for a motor vehicle, comprising:

a mirror assembly having;

a front carrier layer composed of an optically transparent plastic,

a rear carrier layer composed of an optically transparent plastic material,

at least one reflection coating composed of a reflective metallic material, and which is arranged directly on and contacting the rear carrier layer,

an electrically-drivable liquid crystal cell arranged between the front carrier layer and the rear carrier layer, the electrically-drivable liquid crystal cell having outer electrically conductive layers composed of a transparent, electrically conductive material, inner alignment layers composed of a transparent alignment material, and an innermost, liquid crystalline layer between the inner layers such that liquid crystal molecules of the liquid crystalline layer are aligned by the inner alignment layers in a ground state; and

a seal layer arranged substantially coplanar and circumferential at an upper surface and a bottom surface thereof with respect to the innermost, liquid crystalline layer to seal the innermost, liquid crystalline layer between the inner layers, wherein the inner alignment layers, are provided directly on and contacting the liquid crystalline layer and the seal layer.

10. The mirror arrangement of claim 9, further comprising a housing for the mirror assembly.

11. The mirror arrangement of claim 9, wherein the optically transparent plastic material comprises polyethylene terephthalate, or polycarbonate, or polymethyl methacrylate.

12. The mirror arrangement of claim 9, wherein the reflective metallic material comprises a non-transparent silver material, or a non-transparent aluminum material, or a non-transparent chromium material.

13. The mirror arrangement of claim 9, wherein the transparent, electrically conductive material comprises indium tin or indium tin oxide.

14. The mirror arrangement of claim 9, wherein the transparent alignment material comprises a polyimide.

15. The mirror arrangement of claim 9, wherein the mirror assembly further comprises an anti-corrosion layer which terminates the mirror assembly on a rear side thereof.

16. A method for producing a rear-view mirror arrangement for a motor vehicle, the method comprising:

producing a first assembly by providing a front transparent carrier layer composed of an optically transparent plastic film, coating the front, transparent carrier layer with a first electrically conductive layer, and arranging a first alignment layer on the first electrically conductive layer;

producing a second assembly by providing a rear, transparent carrier layer composed of an optically transparent plastic film, including applying at least one reflection coating directly on and contacting the rear, transparent carrier layer, coating the rear, transparent carrier layer with a second electrically conductive layer on an opposite side of the rear, transparent carrier layer, and arranging a second alignment layer on the second electrically conductive layer;

arranging, in a circumferential fashion, a seal layer to the coated surface of the first assembly or the second assembly, and also a liquid crystalline layer sealed within a sealed region by the seal layer, wherein the seal layer is arranged substantially coplanar and circumferential at an upper surface and a bottom surface thereof with respect to the liquid crystalline layer such that the first alignment layer and the second alignment layer are respectively provided directly on and contacting the liquid crystalline layer and the seal layer; and

then

connecting the first assembly and the second assembly under a vacuum.