Display device

• US 20020167498A1
• Filed: 11/30/2001
• Published: 11/14/2002
• Est. Priority Date: 12/21/1999
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Fiess, Reinhold, Eschler, Johannes
• Granted Patent: US 6,791,511 B2
• Time in Patent Office: Days
• US Class Current: 345/204
• CPC Class Codes: G02B 2027/0121 Parasitic image effect attenuation by suitable positioning of the parasitic images
• CPC Class Codes: G02B 2027/0154 with movable elements
• CPC Class Codes: G02B 2027/0156 with optionally usable elements
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence

Abstract

A display device for a motor vehicle is proposed, which is used to display a virtual image on the windshield of a motor vehicle. The image is displayed by way of an image-forming unit which is arranged in an upper area of the windshield or in a region of the vehicle roof, the generated image being guided via a first aspherical mirror and a second aspherical mirror onto the windshield.

Claims

1. A display device in a motor vehicle having an image-forming unit (2), the image-forming unit (2) being arranged in an area of a vehicle roof (3) or in an upper region of a windshield (1) of the vehicle;

having a first aspherical mirror (8) and having a second aspherical mirror (11, 50); and

light emitted by the image-forming unit (2) being transmittable to the first aspherical mirror (8), the first aspherical mirror (8) being arranged in an area of the vehicle roof (3, 7);

the light from the first aspherical mirror (8) being projectable onto the second aspherical mirror (11, 50), the second aspherical mirror (11, 50) being arranged in a region of a dashboard of the vehicle; and

the light from the second aspherical mirror (11) being projectable onto the windshield (1), and a virtual image being able to be formed on the windshield (1).

2. The display device as recited in claim 1,

wherein the second aspherical mirror (11, 50) is arranged on the dashboard, preferably on a top side (10), in a manner that it can be covered.

3. The display device as recited in one of the preceding claims,

wherein the first and/or the second aspherical mirror (8, 11, 50) are motor-adjustable by at least one motor (12, 13).

4. The display device as recited in one of the preceding claims,

wherein an operating control element (15) is arranged in the vehicle, the first aspherical mirror (8) and/or the second aspherical mirror (11, 50) and/or an image brightness of the virtual image projected onto the windshield (1) is adjustable using the operating control element (15).

5. The display device as recited in one of the preceding claims,

wherein the first aspherical mirror (8) has a focal distance in a range from 50 mm to 120 mm, and the second aspherical mirror (11) has a focal distance in a range from 300 mm to 800 mm.

6. The display device as recited in one of the preceding claims,

wherein the image-forming unit (2) is a backlit liquid-crystal cell (33) or a laser display or a micro-mirror display or a vacuum fluorescent display or a plasma display.

7. The display device as recited in one of the preceding claims,

wherein the windshield (1) is wedge-shaped.

8. The display device as recited in one of the preceding claims,

wherein the image-forming unit (2) is arranged on an interior mirror module (40, 41, 43).

9. The display device as recited in one of the preceding claims,

wherein the first aspherical mirror (8) is arranged on an interior mirror module (40, 41).

10. The display device as recited in one of the preceding claims,

wherein the first aspherical mirror (8) is arranged on a housing (43) at the vehicle roof (3).

11. The display device as recited in one of the preceding claims,

wherein a camera (5), preferably an infrared camera, is arranged on the vehicle, and an image picked up by the camera (5) is able to be projected as a virtual image on the windshield (1).

12. The display device as recited in one of the preceding claims,

wherein the second aspherical mirror (11) is covered with a foil, and the foil is designed such that it reduces the visibility of the second aspherical mirror (11).