Dual output headlight system for a vehicle

• US 9,766,454 B2
• Filed: 08/04/2015
• Issued: 09/19/2017
• Est. Priority Date: 08/04/2015
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Chau, Jarvis, Forest, Thomas M.
• Primary Examiner(s): Ngo, Tony N
• Application Number:
  US14/818,021
• Publication Number:
  US 20170038582A1
• Time in Patent Office: 777 Days
• Field of Search: None
• CPC Class Codes: B60Q 1/085 due to special conditions, e.g. adverse weather, type of road, badly illuminated road signs or potential dangers B60Q1/10, B60Q1/12, B60Q1/1423 take precedence
• CPC Class Codes: B60Q 1/143 combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
• CPC Class Codes: B60Q 2300/23 Driver's line of sight
• CPC Class Codes: B60Q 2300/41 preceding vehicle
• CPC Class Codes: B60Q 2300/45 Special conditions, e.g. pedestrians, road signs or potential dangers
• CPC Class Codes: B60Q 2400/50 Projected symbol or information, e.g. onto the road or car body
• CPC Class Codes: F21S 41/125 Coloured light
• CPC Class Codes: F21S 41/16 Laser light sources
• CPC Class Codes: F21S 41/176 Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
• CPC Class Codes: F21S 41/645 by electro-optic means, e.g. liquid crystal or electrochromic devices
• CPC Class Codes: F21S 41/675 by moving reflectors
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21W 2103/60 Projection of signs from lighting devices, e.g. symbols or information being projected onto the road
• CPC Class Codes: G02B 2027/0112 comprising device for genereting colour display
• CPC Class Codes: G02B 2027/0145 creating an intermediate image
• CPC Class Codes: G02B 2027/0181 Adaptation to the pilot/driver
• CPC Class Codes: G02B 2027/0187 slaved to motion of at least a part of the body of the user, e.g. head, eye
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 27/0179 Display position adjusting means not related to the information to be displayed
• CPC Class Codes: G02F 1/33 : Acousto-optical deflection devices circuit or control arrangements therefor G02F1/113
• CPC Class Codes: G03B 21/008 : using micromirror devices
• CPC Class Codes: G09G 2310/0235 : Field-sequential colour display
• CPC Class Codes: G09G 3/001 : using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: G09G 3/3406 : Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336

Abstract

A dual output headlight system includes a projection system having a laser light source to emit incoherent light. The projection system also has a partitioned display surface including a headlight display section and a selectively active augmented display section. The partitioned display surface is positioned in a first path of the incoherent light from the laser light source and to generate a display output. The dual output headlight system also includes an optical splitter positioned in a second path of the display output to split the display output into a headlight illumination output and a graphical output.

Claims

1. A dual output headlight system, comprising:

a projection system configured to be disposed within an automotive vehicle, the projection system including;

a laser light source configured to emit incoherent light;

a partitioned display surface including a headlight display section and a selectively active augmented display section, the partitioned display surface disposed within a first path of the incoherent light and configured to generate a display output;

a body control module operatively connected to the partitioned display surface; and

a vehicle sensory system operatively connected to the body control module;

wherein;

the selectively active augmented display section of the partitioned display surface having a display state selected from at least one of an active state and a dark state, wherein;

in the active state, the display output includes graphical output that forms a projected image on a surface exterior to the automotive vehicle;

in the dark state, the display output does not include the graphical output;

the display state is automatically selectable by the body control module in response to object distance data obtained by the vehicle sensory system; and

an optical splitter positioned in a second path of the display output to split the display output into a headlight illumination output and a graphical output.

2. The dual output headlight system as defined in claim 1 wherein the partitioned display surface includes a pixel array generator portion configured to generate the display output.

3. The dual output headlight system as defined in claim 2 wherein the pixel array generator portion includes at least one of a Micro-Electro-Mechanical Systems (MEMS) shutter array or a digital micromirror device.

4. The dual output headlight system as defined in claim 1 wherein the laser light source includes:

a laser light generator configured to generate laser light; and

a film layer having a laser light-responsive phosphor deposited thereon, wherein the phosphor is configured to emit the incoherent light in response to excitation by the laser light.

5. The dual output headlight system as defined in claim 4 wherein:

the laser light source is configured to emit pulses of the incoherent light, wherein;

the pulses of the incoherent light are discrete pulses of at least 2 primary additive colors,

the pulses of the incoherent light are emitted in a series of frames at a frame rate of at least 60 Hz, each of the frames having the pulses emitted in a predetermined sequence including the at least 2 primary additive colors,

each discrete pulse has only one of the at least 2 primary additive colors, and

each discrete pulse is emitted at a sub-frame rate of at least a product of the frame rate and a total quantity of the at least 2 primary additive colors.

6. The dual output headlight system as defined in claim 5 wherein the at least 2 primary additive colors are red, green and blue.

7. The dual output headlight system as defined in claim 5 wherein:

the laser light source is configured to scan at least a first portion of the headlight display section and at least a second portion of the selectively active augmented display section with a beam of the incoherent light in each discrete pulse; and

the laser light source further includes a beam steering device to controllably direct the beam of the incoherent light to the partitioned display surface.

8. The dual output headlight system as defined in claim 7 wherein the beam steering device is at least one of a Micro-Electro-Mechanical Systems (MEMS) micro mirror or an Acousto-Optic Modulator.

9. The dual output headlight system as defined in claim 1 wherein the laser light source is configured to project the incoherent light on the entire partitioned display surface simultaneously.

10. The dual output headlight system as defined in claim 1 wherein:

the dark state is selected when the object distance data is less than a threshold distance; and

the active state is selected when the object distance data is equal to or greater than the threshold distance.

11. The dual output headlight system as defined in claim 1 wherein the optical splitter is selected from the group consisting of a beam splitter, a motorized projector head, a prism, and a mirror.

12. The dual output headlight system as defined in claim 1 wherein the display output includes the headlight illumination output from the headlight display section and graphical information conveyed by the graphical output.

13. The dual output headlight system as defined in claim 1 wherein the dual output headlight system is configured to illuminate a zone with white light from the headlight illumination output and to project the graphical output as an image projected below the zone with white light.

14. A vehicle system, comprising:

an automotive vehicle;

a body control module operatively disposed within the vehicle;

a vehicle sensory system operatively disposed within the vehicle;

a vehicle bus operatively connecting the body control module and the vehicle sensory system; and

a dual output headlight system responsive to commands from the body control module, the dual output headlight system including;

a laser light source having a laser light generator configured to generate laser light and a film layer having a laser light-responsive phosphor deposited thereon wherein the phosphor is configured to emit incoherent light in response to excitation by the laser light;

a partitioned display surface positioned disposed in a first path of the incoherent light from the laser light source and configured to generate a display output, the partitioned display surface including a headlight illumination section and a selectively active augmented display section wherein;

the partitioned display surface includes a pixel array generator portion configured to generate the display output; and

the selectively active augmented display section is responsive to object distance data obtained by the vehicle sensory system;

wherein;

the selectively active augmented display section of the partitioned display surface having a display state selected from at least one of an active state and a dark state;

in the active state, the display output includes graphical output that forms a projected image on a surface exterior to the automotive vehicle;

in the dark state, the display output does not include the graphical output;

the display state is automatically selectable by the body control module in response to object distance data obtained by the vehicle sensory system, wherein;

the dark state is selected when the object distance data is less than a threshold distance; and

the active state is selected when the object distance data is equal to or greater than the threshold distance; and

an optical splitter disposed in a second path of the display output to split the display output into a headlight illumination output and a graphical output.

15. The vehicle system as defined in claim 14, further comprising an active shutter system wherein:

the graphical output includes a private image portion that conveys private information and a mask image portion;

the private image portion is projected intermittently having visible intervals and masked intervals;

the mask image portion is projected during the masked intervals to prevent the private information from being discernable to a human observer via an eye of the human observer unaided by a temporal decryption device; and

the active shutter system is synchronized with the visible and masked intervals to allow the display output to be optically viewed by a human private viewer during the visible intervals and to eclipse the display output from at least one eye of the private viewer during the masked intervals thereby making the private information discernable to the private viewer.

16. The vehicle system as defined in claim 15 wherein the active shutter system includes:

a window having transparent media disposed between the display output and the at least one eye of the private viewer; and

a Micro-Electro-Mechanical Systems (MEMS) shutter array or a liquid crystal layer disposed on the transparent media wherein;

the MEMS shutter array or the liquid crystal layer has an opaque state and a transparent state;

the MEMS shutter array or the liquid crystal layer enters the opaque state in response to an applied voltage; and

the MEMS shutter array or the liquid crystal layer is transparent in an absence of the applied voltage.

17. The vehicle system as defined in claim 16 wherein the window is supported by an eyeglass frame to be worn by the private viewer.

18. The vehicle system as defined in claim 16 wherein the window is supported by a windshield of the vehicle.

19. The vehicle system as defined in claim 16 wherein the window is rotatably supported by a visor support attached to a body of the vehicle.

20. A method for generating dual output from a vehicle headlight, the method comprising:

receiving information from at least one vehicle system of an automotive vehicle;

generating incoherent light from a laser light source having a laser light generator;

receiving the incoherent light at a partitioned display surface having a headlight illumination section and a selectively active augmented display section, the selectively active augmented display section of the partitioned display surface having a display state selected from at least one of an active state and a dark state;

emitting a headlight illumination portion of a display output from the headlight illumination section of the partitioned display surface, wherein, in the active state, the display output includes a graphical image portion and, in the dark state, the display output does not include the graphical image portion;

in response to receiving the information and determining that an object distance is equal to or greater than a threshold distance, emitting the graphical image portion of the display output from the augmented display section of the partitioned display surface;

transmitting the display output to an optical splitter;

splitting the display output into a headlight illumination output and a graphical output;

illuminating a zone with white light from the headlight illumination output; and

projecting the graphical output onto a surface exterior to the automotive vehicle as an image projected below the zone with white light.

21. The method as defined in claim 20 wherein:

the incoherent light generated by the laser light source is emitted in a series of frames at a frame rate of at least 60 Hz, each of the frames having discrete pulses emitted in a predetermined sequence including at least 2 primary additive colors;

each discrete pulse has only one of the at least 2 primary additive colors; and

each discrete pulse is emitted at a sub-frame rate of at least a product of the frame rate and a total quantity of the at least 2 primary additive colors.

22. The method as defined in claim 21 wherein the at least 2 primary additive colors are red, green, and blue.

23. The method as defined in claim 20, further comprising:

receiving a driver eye location from an eye tracker connected to a vehicle bus; and

aligning the graphical output in response to the driver eye location.