Heads up display

• US 20090231720A1
• Filed: 03/12/2008
• Published: 09/17/2009
• Est. Priority Date: 03/12/2008
• Status: Abandoned Application

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Inventors: Chengalva, Mahesh K.
• Application Number:
  US12/075,546
• Publication Number:
  US 20090231720A1
• Time in Patent Office: Days
• US Class Current: 359/630
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 2027/0141 characterised by the informative content of the display
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence

Abstract

A heads up display apparatus for a vehicle having a windshield includes an LED display having alphanumeric characters which are at least reflected off of the vehicle windshield toward the driver. The display has power controls and, optionally, a variable brightness control through a manually driver manipulatable control member or automatically through an ambient light sensor output coupled to the display. A vehicle operating parameter output is coupled to the display and converted by the display into illuminated alphanumeric characters. Each element of each LED character includes a reflected element image and at least a partially refracted and reflected ghost element image which have juxtaposed and overlapped element to form a combined single image to the viewer.

Claims

1. A heads up display apparatus for a vehicle having a windshield, the apparatus comprising:

an LED display having an alphanumeric LED character output mounted in the vehicle to at least reflect an image of the LED character output from a vehicle windshield toward a vehicle driver.

2. The apparatus of claim 1 further comprising:

a vehicle operating parameter input coupled to the display.

3. The apparatus of claim 2 wherein:

the vehicle operating parameter input is at least one of the vehicle speed, the vehicle engine rpm, the vehicle fuel quantity, the vehicle turn signal condition, and

the vehicle headlight condition.

4. The apparatus of claim 1 further comprising:

a brightness control input coupled to the display for controlling the brightness of the LED character output.

5. The apparatus of claim 4 wherein the brightness control input comprises:

a user manipulated control member coupled to the display.

6. The apparatus of claim 4 wherein:

the brightness control input is an ambient light signal.

7. The apparatus of claim 5 further comprising:

the control member connecting a power source to the display for turning the display on and off.

8. The apparatus of claim 1 further comprising:

a power on and power off control member coupled to the display for controlling the application of electric power to the display.

9. The apparatus of claim 1 wherein:

a width of each longitudinally extending element of each LED character in the composite image is greater than a width of each laterally extending LED element of each LED character.

10. A viewed image of a heads up display comprising:

a first image of at least one LED heads up display character formed of a plurality of LED elements reflected off an inner surface of a vehicle windshield toward a viewer;

a second image of the at least one LED element at least refracted from the vehicle windshield toward a viewer; and

the first and second images disposed in an overlapping composite image to the viewer.

11. The viewed image of claim 10 wherein the first and second images are partially overlapped.

12. The viewed image of claim 10 wherein the composite image comprises:

LED elements of each LED character extending vertically and horizontally as viewed by the viewer;

the vertically extending elements of the first and second images being disposed in overlapping arrangement in the composite image; and

the horizontally extending elements of the first and second images are juxtaposed in the composite images.

13. The viewed image of claim 12 wherein:

the horizontally extending first and second image elements are juxtaposed to each other to each form a single enlarged combined width horizontally extending composite viewed image.

14. The viewed image of claim 12 wherein:

the vertically extending first and second elements overlap to form a single, brighter, vertically extending element in the composite viewed image.

15. The viewed image of claim 10 wherein:

a width of each longitudinally extending element of each LED character in the composite image is greater than a width of each laterally extending LED element of each LED character in the composite image.

16. A method of forming an LED display having at least one LED character output formed of horizontally and vertically extending reflected and refracted elements comprising the steps of:

determining a width of each vertically extending LED element and the width of each horizontally extending LED element of a reflected image and a refracted image of each LED character to define a single composite, at least partially overlapped image to the viewer taking into consideration the inclination angle of a vehicle windshield, with respect to the orientation of the LED display, the thickness of the vehicle windshield, and the refraction index of the material forming the vehicle windshield.

17. The method of claim 16 further comprising the steps of:

mounting an LED display in a vehicle; and

reflecting an image of at least one LED character forming the LED display from the windshield toward a viewer.

18. The method of claim 17 further comprising:

coupling a vehicle operating parameter input to the LED display.

19. The method of claim 18 comprising the step of:

selecting the vehicle operating input to be at least one of the vehicle speed, the vehicle engine rpm, the vehicle fuel quantity, the vehicle turn signal condition, and

the vehicle headlight condition.

20. The method of claim 17 further comprising the step of:

coupling a brightness control input to the LED display for controlling the brightness of the LED display character output.

21. The method of claim 17 comprising the step of:

forming the composite image of the first and second images to include LED elements for each LED character extending vertically and horizontally as viewed by the viewer;

disposing the vertically extending elements of the first and second images in overlapping arrangement; and

disposing the horizontally extending elements of the composite image in a juxtaposed arrangement.

22. The method of claim 21 comprising the step of:

juxtaposing each horizontally extending first and second image element to each other to each form a single enlarged combined width composite image element.

23. The method of claim 21 comprising the step of:

overlapping each vertically extending first and second element to form a single brighter element in the composite image viewed by the viewer.

24. The method of claim 21 comprising the step of:

forming a width of each longitudinally extending element of each LED character in the composite image greater than a width of each laterally extending LED element of each LED character.