Steering wheel light bar

• US 10,036,843 B2
• Filed: 04/25/2016
• Issued: 07/31/2018
• Est. Priority Date: 04/24/2015
• Status: Active Grant

• Current Assignee: Joyson Safety Systems Acquisition, LLC
• Original Assignee: Joyson Safety Systems Acquisition, LLC
• Inventors: Lisseman, Jason Carl
• Primary Examiner(s): Merlin, Jessica M
• Application Number:
  US15/137,646
• Publication Number:
  US 20160311366A1
• Time in Patent Office: 827 Days
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/006 to produce indicia, symbols, texts or the like
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02B 6/0093 Means for protecting the light guide
• CPC Class Codes: G02F 1/13 based on liquid crystals, e.g. single liquid crystal display cells
• CPC Class Codes: G02F 2201/56 Substrates having a particular shape, e.g. non-rectangular

Abstract

Various implementation of a light bar warning system for a steering wheel of a vehicle include a liquid crystal display (LCD), a light guide, and at least one light source disposed adjacent the light guide. The LCD and light guide having arcuate shaped surfaces that follow along a portion of the steering wheel rim. Light emitted from the light source is transmitted through the light guide and out of its outer surface into an inner surface of the LCD that is disposed adjacent the light guide. The light is emitted through portions of the LCD that are activated for illumination by an LCD driver. The LCD may provide various types of warnings to the operator, including blind spot warnings, forward collision/proximity warnings, and lane departure warnings, for example.

Claims

1. A light bar system for a steering wheel of a vehicle, the display system comprising:

a light guide having an outer surface and an inner surface that extend between a first end and a second end of the light guide, the outer and inner surfaces of the light guide being arcuate-shaped between the ends of the light guide and spaced apart and opposite each other relative to a plane that extends through the first and second ends of the light guide and is parallel to the outer and inner surfaces of the light guide;

at least one light source disposed adjacent the first end of the light guide, the light source configured for emitting light into the first end of the light guide, wherein the light guide is configured for transmitting light from the light source through at least a portion of the outer surface of the light guide

an outer lens having an outer surface and an inner surface that extend between a first end and a second end of the outer lens, the outer and inner surfaces of the outer lens being arcuate-shaped between the ends of the outer lens and spaced apart and opposite each other relative to a plane that extends through the first and second ends of the outer lens and is parallel to the outer and inner surfaces of the outer lens, wherein the inner surface of the outer lens is disposed adjacent the outer surface of the light guide; and

a liquid crystal display (LCD) having an outer surface and an inner surface that extend between a first end and a second end of the LCD, the outer and inner surfaces of the LCD being arcuate-shaped between the ends of the LCD and spaced apart and opposite each other relative to a plane that extends through the first and second ends of the LCD and is parallel to the outer and inner surfaces of the LCD, wherein the LCD is disposed between the outer surface of the light guide and the inner surface of the outer lens.

2. The light bar system of claim 1, wherein the LCD is an improved black nematic (IBN) display.

3. The light bar system of claim 1, wherein the light source is a light emitting diode (LED).

4. The light bar system of claim 3, wherein the LED is a top-firing LED.

5. The light bar system of claim 4, further comprising a printed circuit board (PCB), the PCB having a surface on which the LED is disposed, and the surface being arranged at an angle of about 90°

to the outer and inner surfaces of the light guide.

6. The light bar system of claim 5, further comprising a computer processor configured for electrically communicating with a driver of the LCD, the computer processor being disposed on a rotatable portion of the steering wheel.

7. The light bar system of claim 6, wherein the computer processor is disposed adjacent the LCD.

8. The light bar system of claim 5, wherein the PCB is directly coupled to a frame of the steering wheel.

9. The light bar system of claim 5, further comprising a frame coupling member, the frame coupling member being directly coupled to the PCB and the frame, wherein at least a portion of the heat generated by the PCB is transferred through the frame coupling member to the frame.

10. The light bar system of claim 1, further comprising a computer processor configured for electrically communicating with a driver of the LCD, the computer processor being disposed on a rotatable portion of the steering wheel.

11. The light bar system of claim 10, wherein the computer processor is disposed adjacent the LCD.

12. The light bar system of claim 1, wherein the light source is a first light source, and further comprising a second light source disposed adjacent the second end of the light guide, the second light source configured for emitting light into the second end of the light guide.

13. The light bar system of claim 1, further comprising a tray disposed adjacent the inner surface of the light guide, the tray comprising a reflective surface that is configured for reflecting light into the light guide.

14. The light bar system of claim 13, wherein the tray comprises an arcuate-shaped floor and two side surfaces that extend orthogonally away from the floor of the tray, the floor of the tray being disposed adjacent the inner surface of the light guide.

15. The light bar system of claim 14, wherein the LCD is disposed between the two side surfaces of the tray.

16. The light bar system of claim 1, wherein the outer surface of the light guide comprises a plurality of micro-lenses configured for guiding light exiting the outer surface of the light guide to exit at an angle of about 90°

from the outer surface.

17. The light bar system of claim 1, wherein the outer lens.

18. The light bar system of claim 1, wherein:

the inner and outer surfaces of the LCD and light guide have a radius of curvature that corresponds to a radius of curvature of an arcuate shaped portion of a frame of the steering wheel, and

the LCD and light guide are configured for being coupled to the arcuate shaped portion of the frame such that the inner and outer surfaces of the LCD and light guide follow the arcuate-shaped portion of the frame.

19. The light bar system of claim 18, wherein the LCD and light guide are disposed within an arcuate shaped tray, and the arcuate shaped tray is coupled to the arcuate shaped portion of the frame.

20. The light bar system of claim 19, further comprising a frame coupling member, wherein the tray is coupled directly to the frame coupling member, and the frame coupling member is coupled directly to the arcuate shaped portion of the frame.

21. A light bar system for a steering wheel of a vehicle, the display system comprising:

a light guide having an outer surface and an inner surface that extend between a first end and a second end of the light guide, the outer and inner surfaces of the light guide being arcuate-shaped between the ends and spaced apart and opposite each other relative to a plane that extends through the first and second ends of the light guide and is parallel to the outer and inner surfaces of the light guide;

at least one light source disposed adjacent the first end of the light guide, the light source configured for emitting light into the first end of the light guide, wherein the light guide is configured for transmitting light from the light source through at least a portion of the outer surface of the light guide;

an outer lens having an outer surface and an inner surface that extend between a first end and a second end of the outer lens, the outer and inner surfaces of the outer lens being arcuate-shaped between the ends of the outer lens and spaced apart and opposite each other relative to a plane that extends through the first and second ends of the outer lens and is parallel to the outer and inner surfaces of the outer lens, wherein the inner surface of the outer lens is disposed adjacent the outer surface of the light guide; and

an outer cap having an outer surface and an inner surface that extend between a first end and a second end of the outer cap, the outer and inner surfaces of the outer cap being arcuate-shaped between the ends of the outer cap and spaced apart and opposite each other, wherein the inner surface of the outer cap is disposed adjacent the outer surface of the light guide, and wherein the outer cap defines an arcuate shaped opening, and the outer lens is coupled to the outer cap adjacent the opening.

22. The light bar system of claim 21, further comprising one or more light directing films disposed between the outer surface of the light guide and the inner surface of the outer lens.

23. The light bar system of claim 21, wherein:

the inner and outer surfaces of the lens and the light guide have a radius of curvature that corresponds to the radius of curvature of an arcuate shaped portion of a frame of the steering wheel, and

the lens and light guide are configured for being coupled to the arcuate shaped portion of the frame such that the inner and outer surfaces of the lens and light guide follow the arcuate-shaped portion of the frame.

24. The light bar system of claim 23, wherein the light guide is configured for transmitting light through the entire outer surface of the light guide.

25. The light bar system of claim 21, wherein the light source is a first light emitting diode, and the system further comprises a second light emitting diode adjacent the second end of the light guide, the second light emitting diode configured for emitting light into the second end of the light guide.

26. The light bar system of claim 21, wherein the light source is a light emitting diode (LED).

27. The light bar system of claim 26, wherein the LED is a top-firing LED.

28. The light bar system of claim 27, further comprising a printed circuit board (PCB), the PCB having a surface on which the LED is disposed, and the surface being arranged at an angle of about 90°

to the outer and inner surfaces of the light guide.

29. The light bar system of claim 28, wherein the PCB is directly coupled to the frame of the steering wheel.

30. The light bar system of claim 28, further comprising a frame coupling member, the frame coupling member being directly coupled to the PCB and the frame, wherein at least a portion of the heat generated by the PCB is transferred through the frame coupling member to the frame.

31. The light bar system of claim 21, further comprising a tray disposed adjacent the inner surface of the light guide, the tray comprising a reflective surface that is configured for reflecting light into the light guide.

32. The light bar system of claim 31, wherein the tray comprises an arcuate-shaped floor and two side surfaces that extend orthogonally away from the floor of the tray, the floor of the tray being disposed adjacent the inner surface of the light guide.