Projection display with motion compensation

• US 20070176851A1
• Filed: 12/06/2006
• Published: 08/02/2007
• Est. Priority Date: 12/06/2005
• Status: Abandoned Application

• Current Assignee: Microvision, Inc.
• Original Assignee: Microvision, Inc.
• Inventors: Wiklof, Christopher, Sprague, Randall, Willey, Stephen
• Application Number:
  US11/635,799
• Publication Number:
  US 20070176851A1
• Time in Patent Office: Days
• US Class Current: 345/32
• CPC Class Codes: G02B 26/101 with both horizontal and vertical deflecting means, e.g. raster or XY scanners colour television using laser beams scanning a display screen H04N9/3129
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G03B 21/142 Adjusting of projection optics
• CPC Class Codes: G03B 2206/00 Systems for exchange of information between different pieces of apparatus, e.g. for exchanging trimming information, for photo finishing
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2340/145 related to small screens
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/002 to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT
• CPC Class Codes: G09G 5/363 Graphics controllers
• CPC Class Codes: G09G 5/393 Arrangements for updating the contents of the bit-mapped memory
• CPC Class Codes: H04N 5/144 Movement detection for video coding H04N19/503; analysis of motion in general G06T7/20
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 5/7416 involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
• CPC Class Codes: H04N 9/31 Projection devices for colour picture display , e.g. using electronic spatial light modulators [ESLM]
• CPC Class Codes: H04N 9/3102 using two-dimensional electronic spatial light modulators micromechanical modulators as such G02B26/0833; liquid crystal modulators as such G02F1/13
• 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 9/3179 Video signal processing therefor
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A control system for a projection display includes means for compensating for relative movement between a projection display and a projection surface and/or between a projected image and a viewer. The system may compensate for image shake. Movement may be detected optically, through motion or inertial detection, etc. The image may be compensated by modifying image properties such as resolution, by modifying an image bitmap, by moving a display engine or a display engine component, and/or by deflecting the projection axis, for example. According to an embodiment the projection display may include a display engine utilizing a laser scanner.

Claims

1. A projection display comprising:

a display engine operable to project an image;

a sensor operable to generate a signal responsive to a motion; and

a controller operable receive the signal from the sensor and responsively drive the display engine to project an image that includes compensation for the motion.

2. The projection display of claim 1 wherein the image the compensation for the motion includes selecting an image resolution that corresponds to the motion.

3. The projection display of claim 2 wherein the controller is operable to set image resolution lower when the amount of motion is larger.

4. The projection display of claim 1 wherein the display engine is operable to project the image along a plurality of axes and the image that compensates for the motion is projected along a projection axis that improves the stability of the projected image location.

5. The projection display of claim 4 further comprising an actuated optical element and wherein the projection display is operable to select from among the plurality of image projection axes by actuating the optical element.

6. The projection display of claim 5 wherein the actuated optical element includes an optical axis deflector.

7. The projection display of claim 4 wherein the controller is operable to select from a plurality of bitmapped display regions corresponding to a plurality of projection axes.

8. The projection display of claim 4 wherein the display engine includes an actuator operable to select a plurality of positions corresponding to a plurality of projection axes.

9. The projection display of claim 8 wherein the actuator is operable to reposition a component of the display engine.

10. The projection display of claim 1 wherein the sensor includes a motion sensor.

11. The projection display of claim 1 wherein the sensor includes an optical sensor.

12. The projection display of claim 11 wherein the optical sensor is operable to detect the position of a projected image relative to a projection surface.

13. The projection display of claim 1 wherein the controller is further operable to compute a model of a sequence of detected motions and drive the display engine according to the model.

14. The projection display of claim 1 wherein the display engine includes a scanned beam display engine.

15. The projection display of claim 1 further comprising a hand-supportable housing.

16. The projection display of claim 15 further comprising at least one user-accessible control.

17. The projection display of claim 1 further comprising an image source.

18. The projection display of claim 17 further comprising a hand-supportable housing and where the display engine and the sensor are coupled to the hand-supportable housing and the controller is coupled to the image source.

19. A method of compensating for image shake in a projection display comprising the steps of:

detecting image shake; and

projecting an image that compensates for the image shake.

20. The method of compensating for image shake in a projection display of claim 19 wherein projecting an image that compensates for the image shake includes selecting an image resolution that corresponds to the image shake.

21. The method of compensating for image shake in a projection display of claim 20 wherein projecting an image that compensates for the image shake includes setting an image resolution lower when the amount of image shake is larger.

22. The method of compensating for image shake in a projection display of claim 19 wherein projecting an image that compensates for the image shake includes projecting the image along a projection axis that improves the stability of the projected image location.

23. The method of compensating for image shake in a projection display of claim 22 wherein projecting the image along a projection axis that improves the stability of the projected image location includes selecting from among a plurality of image projection axes by actuating an optical element.

24. The method of compensating for image shake in a projection display of claim 23 wherein actuating an optical element includes actuating an optical axis deflector.

25. The method of compensating for image shake in a projection display of claim 22 wherein projecting the image along a projection axis that improves the stability of the projected image location includes selecting from among a plurality of bitmapped display regions corresponding to a plurality of projection axes.

26. The method of compensating for image shake in a projection display of claim 22 wherein projecting the image along a projection axis that improves the stability of the projected image location includes actuating at least a portion of a display engine to one of a plurality of positions corresponding to a plurality of projection axes.

27. The method of compensating for image shake in a projection display of claim 26 wherein actuating at least a portion of a display engine is operable to reposition a component of the display engine.

28. The method of compensating for image shake in a projection display of claim 19 wherein detecting image shake includes receiving a signal from a motion sensor.

29. The method of compensating for image shake in a projection display of claim 19 wherein detecting image shake includes receiving a signal from an optical sensor.

30. The method of compensating for image shake in a projection display of claim 29 wherein the signal from the optical sensor corresponds to the position of a projected image relative to a projection surface.

31. The method of compensating for image shake in a projection display of claim 19 further comprising the step of computing a model of a sequence of detected motions and the step of projecting an image that compensates for the image shake includes driving a display engine according to the model.

32. The method of compensating for image shake in a projection display of claim 19 wherein the step of projecting an image that compensates for the image shake includes driving a display engine.

33. The method of compensating for image shake in a projection display of claim 32 wherein driving the display engine includes driving a scanned beam display engine.

34. The method of compensating for image shake in a projection display of claim 19 further comprising projecting the image from a hand-supportable housing.

35. The method of compensating for image shake in a projection display of claim 34 further comprising receiving at least one user input from a user-accessible control.

36. The method of compensating for image shake in a projection display of claim 19 further comprising receiving an image from an image source.

37. The method of compensating for image shake in a projection display of claim 36 further comprising the steps of:

sending a parameter corresponding to the detected image shake to the image source; and

receiving data from the image source that compensates for the image shake.

38. A system comprising:

a display operable to display an image; and

a motion detection circuit operable to stabilize the image.

39. The system of claim 38 wherein the display is configured as a heads-up display.

40. The system of claim 39 further comprising a vehicle instrumentation system operable to provide data to the heads-up display.

41. The system of claim 38 wherein the display is configured as a portable electronic device display.

42. The system of claim 41 wherein the portable electronic device includes a cellular telephone.