Switchable rearview mirror element with anti-reflection mechanisms for use with a display

• US 9,637,054 B2
• Filed: 02/14/2014
• Issued: 05/02/2017
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Gentex Corporation
• Original Assignee: Gentex Corporation
• Inventors: VanderPloeg, John A, VanVuuren, Mark A, Lee, Ethan J
• Primary Examiner(s): Sugarman, Scott J
• Assistant Examiner(s): Choudhury, Mustak
• Application Number:
  US14/180,458
• Publication Number:
  US 20140268351A1
• Time in Patent Office: 1,173 Days
• Field of Search: 359247, 359252, 359253, 359265, 359267, 359832, 359599, 359839, 359840, 359850, 359871, 359872, 359242, 359245, 359263, 359275, 359601-609, 428216, 428432, 428701, 428702, 428913, 349195
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: B60R 2001/1215 with information displays

Abstract

The embodiments described herein generally relate to a rearview mirror assembly for a vehicle. More particularly, they relate to a rearview mirror assembly including a switchable reflective element and a display. The switchable reflective element is a type that is selectively switchable between a reflective mode and a transmissive mode. The display is positioned behind the switchable reflective element for displaying images through the switchable reflective element when in the transmissive mode. The rearview mirror assembly may further include either an anti-reflection coating provided on at least one of the front and rear sides of the switchable reflective element, or first and second prisms provided on opposite sides of the switchable reflective element.

Claims

1. A rearview mirror assembly for a vehicle comprising:

a switchable reflective element that is a switchable liquid crystal reflective element that, in response to an electrical potential, is selectively switchable between a reflective mode and a transmissive mode, wherein said switchable reflective element includes a front side and a rear side, where the front side is closer to a driver of the vehicle;

a display positioned behind the rear side of said switchable reflective element for displaying images through said switchable reflective element when in the transmissive mode such that a large percentage of light from said display is transmitted through said switchable reflective element while ambient light and glare light are absorbed; and

an anti-reflection coating provided on at least one of the front and rear sides of said switchable reflective element,

wherein, when in the reflective mode, said switchable reflective element reflects ambient light and glare light.

2. The rearview mirror assembly of claim 1, wherein said anti-reflection coating is provided on the front side of said switchable reflective element.

3. The rearview mirror assembly of claim 1, wherein said anti-reflection coating is provided on the rear side of said switchable reflective element.

4. The rearview mirror assembly of claim 1, wherein said anti-reflection coating is provided on both the front and rear sides of said switchable reflective element.

5. The rearview mirror assembly of claim 1, wherein said display is a liquid crystal display.

6. A rearview mirror assembly for a vehicle comprising:

a switchable reflective element that is selectively switchable between a reflective mode and a transmissive mode, wherein said switchable reflective element includes a front side and a rear side;

a display positioned behind the rear side of said switchable reflective element for displaying images through said switchable reflective element when in the transmissive mode;

a first prism provided on at least one of the front and rear sides of said switchable reflective element; and

a second prism, wherein said first and second prisms are provided on opposite sides of said switchable reflective element.

7. The rearview mirror assembly of claim 6, wherein said first prism has an apex and wherein said first prism is disposed on the front side such that the apex of said first prism is proximate a top edge of said switchable reflective element.

8. The rearview mirror assembly of claim 7, wherein said second prism has an apex and wherein said second prism is disposed on the rear side such that the apex of said second prism is proximate a top edge of said switchable reflective element.

9. The rearview mirror assembly of claim 7, wherein said second prism has an apex and wherein said second prism is disposed on the rear side such that the apex of said second prism is proximate a bottom edge of said switchable reflective element.

10. The rearview mirror assembly of claim 7, wherein said switchable reflective element is a switchable liquid crystal reflective element.

11. The rearview mirror assembly of claim 10, wherein said display is a liquid crystal display.

12. The rearview mirror assembly of claim 6, wherein said second prism has an apex and wherein said second prism is disposed on the rear side such that the apex of said second prism is proximate a top edge of said switchable reflective element.

13. The rearview mirror assembly of claim 6, wherein said second prism has an apex and wherein said second prism is disposed on the rear side such that the apex of said second prism is proximate a bottom edge of said switchable reflective element.

14. The rearview mirror assembly of claim 6, wherein said switchable reflective element is a switchable liquid crystal reflective element.

15. The rearview mirror assembly of claim 14, wherein said display is a liquid crystal display.

16. The rearview mirror assembly of claim 6, wherein said display is a liquid crystal display.

17. The rearview mirror assembly of claim 6, wherein said second prism has an apex and wherein said second prism is disposed on the rear side such that the apex of said second prism is proximate one of a top edge and a bottom edge of said switchable reflective element.

18. The rearview mirror assembly of claim 6, wherein said second prism is positioned between said switchable reflective element and said display.