Scanning laser projection display devices and methods for projecting one or more images onto a surface with a light-scanning optical fiber

• US 8,757,812 B2
• Filed: 05/19/2009
• Issued: 06/24/2014
• Est. Priority Date: 05/19/2008
• Status: Active Grant

• Current Assignee: University of Washington
• Original Assignee: University of Washington
• Inventors: Johnston, Richard S., Lee, Cameron M., Seibel, Eric J., Schowengerdt, Brian T., Melville, Charles D.
• Primary Examiner(s): Bui Pho, Pascal M
• Application Number:
  US12/468,832
• Publication Number:
  US 20090316116A1
• Time in Patent Office: 1,862 Days
• Field of Search: 250/221, 250234-236, 250/216, 250/227.11, 250/227.2, 250/227.21, 353/30, 353/31, 353/46, 353/50, 353/98, 353/99, 353/121, 353/122, 353/85, 353/87, 385/25, 385/31, 385/15, 359/196.1, 359/197.1, 359/202.1, 359/203.1, 359/212.1, 359/212.2, 359/213.1, 359/214.1, 359/223.1, 348/195, 348/197, 348203-205
• US Class Current: 353/85
• CPC Class Codes: A61B 1/0008 characterised by distal tip features
• CPC Class Codes: A61B 1/00165 with light-conductive means, e.g. fibre optics A61B1/07 takes precedence
• CPC Class Codes: A61B 1/00172 with means for scanning
• CPC Class Codes: A61B 1/0638 providing two or more wavelengths
• CPC Class Codes: A61B 1/07 using light-conductive means, e.g. optical fibres
• CPC Class Codes: A61B 5/0062 Arrangements for scanning
• CPC Class Codes: G02B 26/103 having movable or deformable optical fibres, light guides or waveguides as scanning elements light guides per se G02B6/00
• CPC Class Codes: G02B 6/262 Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
• CPC Class Codes: G03B 21/00 Projectors or projection-type viewers; Accessories therefor devices for changing pictures G03B23/00
• CPC Class Codes: G03B 21/20 Lamp housings
• CPC Class Codes: H04N 9/3129 scanning a light beam on the display screen scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161
• CPC Class Codes: H04N 9/3135 Driving therefor
• CPC Class Codes: H04N 9/3173 wherein the projection device is specially adapted for enhanced portability

Abstract

Image projection devices, high-speed fiber scanned displays and related methods for projecting an image onto a surface and interfacing with the projected image are provided. A method for projecting one or more images and obtaining feedback with an optical input-output assembly is provided. The input-output assembly comprising a light-scanning optical fiber and a sensor. The method includes generating a sequence of light in response to one or more image representations and a scan pattern of the optical fiber, articulating the optical fiber in the scan pattern, projecting the sequence of light from the articulated optical fiber, and generating a feedback signal with the sensor in response to reflections of the sequence of light.

Claims

1. An improved method for projecting one or more images onto a surface with a projection device comprising a light-scanning optical fiber, the method comprising:

generating a sequence of light in response to one or more image representations and a drive signal determining a scan pattern of the optical fiber;

articulating the optical fiber in the scan pattern based on the drive signal, wherein a distal tip of the fiber has a variable velocity; and

projecting the generated sequence of light from the articulated optical fiber to form the one or more images on the surface, wherein the fiber is scanned within a Q factor of a resonant frequency of the optical fiber, wherein the generating of the sequence of light comprises varying a light intensity based on the drive signal such that the light intensity is varied based on both a position in the one or more image representations and a positional rate of change of the optical fiber in the scan pattern and wherein the intensity increases based on the variable velocity increasing.

2. The method of claim 1, wherein the scan pattern comprises at least one of a spiral pattern, an expanding ellipse pattern, or a Lissajous pattern.

3. The method of claim 1, wherein the scan pattern in a single frame comprises a first portion providing a first resolution and a second portion providing a second resolution that is different from the first resolution.

4. The method of claim 1, wherein varying the light intensity comprises at least one of varying an amount of intensity of light in the sequence of light or varying a light pulse duration in the sequence of light.

5. The method of claim 1, further comprising:

articulating the optical fiber in a second scan pattern in a second frame, the second scan pattern having a different throw angle than the first scan pattern in a first frame;

generating a second sequence of light in response to a second one or more image representations and the second scan pattern; and

projecting the second sequence of light from the articulated optical fiber to form the second one or more images on the surface.

6. The method of claim 1, further comprising:

articulating the optical fiber in a second scan pattern in a second frame, the second scan pattern providing a different resolution than the first scan pattern in a first frame;

generating a second sequence of light in response to a second one or more image representations and the second scan pattern; and

projecting the second sequence of light from the articulated optical fiber to form the second one or more images on the surface.

7. The method of claim 1, wherein generating the sequence of light comprises buffering an image representation in a memory device and reading the buffered image representation according to the scan pattern.

8. The method of claim 1, wherein:

the images include video images; and

the method further comprises adjusting the number of settling cycles to match the video frame rate.

9. The method of claim 1, further comprising:

determining an orientation of the projection device; and

modifying the projected light output based on the determined projection device orientation.

10. The method of claim 1, wherein:

the projected one or more images comprise a first portion and a second portion;

the first portion corresponding to the one or more image representations; and

the second portion is projected by a portion of the scan pattern that is not used to project the first portion, the second portion including additional image content.

11. A system for projecting one or more images onto a surface, the system comprising:

a projection device comprising a light-scanning optical fiber, the projection device operable to project a sequence of light from the light-scanning fiber onto a surface according to a scan pattern;

a laser assembly coupled with the light-scanning optical fiber and operable to generate the sequence of light; and

a processor coupled with the light-scanning assembly and the laser assembly, the processor comprising a tangible medium, the tangible medium comprising instructions that when executed cause the processor to;

generate the sequence of light in response to one or more image representations and the scan pattern comprising a varying light intensity based on a drive signal such that light intensity is varied based on both a position in the one or more image representations and a positional rate of change of the optical fiber in the scan pattern,

articulate the optical fiber in the scan pattern based on the drive signal, in order to scan the optical fiber within a Q factor of a resonant frequency of the optical fiber such that a distal tip of the fiber has a variable velocity; and

provide control signals to the laser assembly and the light-scanning assembly to increase the intensity based on the variable velocity increasing in order to project the sequence of light according to the scan pattern to form the one or more images on the surface.

12. The system of claim 11, wherein the laser assembly comprises:

at least one of a red laser, a green laser, and a blue laser; and

a combiner to combine output from the at least one of a red laser, a green laser, and a blue laser, wherein the combined output is projected through the light scanning fiber.

13. The system of claim 12, wherein at least one of the red laser, the green laser, or the blue laser are remotely located relative to the combiner and coupled with the combiner via separate optical paths.

14. The system of claim 11, wherein a formed image comprises a first portion comprising a first image resolution and a second portion comprising a second image resolution that is different from the first resolution.

15. The system of claim 11, further comprising a memory buffer to store an image representation, and wherein the processor reads the buffered image representation according to the scan pattern.

16. The system of claim 11, wherein the processor generates the sequence of light by varying an amount of light in the sequence of light in response to a positional rate of change of the optical fiber in the scan pattern.

17. The system of claim 11, wherein the processor can vary the scanning of the light-scanning fiber so as to provide different throw angles.

18. The system of claim 11, wherein the processor can vary the scanning of the light-scanning fiber so as to provide different image resolutions.

19. The system of claim 11, wherein the processor can vary the scanning of the light-scanning fiber so as to match a video frame rate.