Static Stray Light Removal for MEMS Feed Optics in a Scanned Beam Display

• US 20110286068A1
• Filed: 05/21/2010
• Published: 11/24/2011
• Est. Priority Date: 05/21/2010
• Status: Abandoned Application

• Current Assignee: Microvision, Inc.
• Original Assignee: Microvision, Inc.
• Inventors: Hudman, Joshua M.
• Application Number:
  US12/784,660
• Publication Number:
  US 20110286068A1
• Time in Patent Office: Days
• US Class Current: 359/207.8
• 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 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G03B 21/14 Details
• 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

Abstract

Briefly, in accordance with one or more embodiments, a scanned beam display comprises a light source to generate a light beam and a scanning platform to receive the light beam and to scan the light beam as a projected image. The scanned beam display further comprises first and second optics, wherein the first optic directs the light beam onto the scanning platform to be reflected through the second optic as the projected image. A reflective surface disposed on at least one of the first optic or the second optic reflect stray light away from the projected image.

Claims

1. An apparatus, comprising:

a light source to generate a light beam;

a scanning platform to receive the light beam and to scan the light beam as a projected image;

first and second optics, wherein the first optic directs the light beam onto the scanning platform to be reflected through the second optic as the projected image; and

a reflective surface disposed on at least one of the first optic or the second optic to reflect stray light away from the projected image.

2. An apparatus as claimed in claim 1, wherein the reflective surface comprises a total internal reflection surface.

3. An apparatus as claimed in claim 1, wherein the light source comprises one or more laser sources, and the light beam comprises one or more laser beams.

4. An apparatus as claimed in claim 1, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic.

5. An apparatus as claimed in claim 1, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic to redirect a stray light beam reflected off an internal surface of the first optic.

6. An apparatus as claimed in claim 1, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic to redirect a stray light beam reflected off an external surface of the first optic.

7. An apparatus as claimed in claim 1, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic to reflect stay light away from the projected image while allowing the light beam to pass through the reflective surface as the projected image.

8. An apparatus as claimed in claim 1, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic, and wherein angles of reflection of stray light off an internal surface of the first optic or an external surface of the first optic, or combinations thereof, and an angle of the surface of the second wedge optic having the reflective surface are selected to allow reflection of the stray light off the reflective surface.

9. A scanned beam display, comprising:

housing having an internal surface that is at least partially light absorbing and further having an opening formed therein;

a light source disposed in the housing to generate a light beam;

a scanning platform disposed to receive the light beam and to scan the light beam as a projected image projected through the opening of the housing;

first and second optics, wherein the first optic directs the light beam onto the scanning platform to be reflected through the second optic as the projected image; and

a reflective surface disposed on at least one of the first optic or the second optic to reflect stray light away from opening of the housing to be at least partially absorbed by the internal surface of the housing.

10. A scanned beam display as claimed in claim 9, wherein the reflective surface comprises a total internal reflection surface.

11. A scanned beam display as claimed in claim 9, wherein the light source comprises one or more laser sources, and the light beam comprises one or more laser beams.

12. A scanned beam display as claimed in claim 9, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic.

13. A scanned beam display as claimed in claim 9, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic to redirect a stray light beam reflected off an internal surface of the first optic.

14. A scanned beam display as claimed in claim 9, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic to redirect a stray light beam reflected off an external surface of the first optic.

15. A scanned beam display as claimed in claim 9, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic to reflect stay light away from the projected image while allowing the light beam to pass through the reflective surface as the projected image.

16. A scanned beam display as claimed in claim 9, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic, and wherein angles of reflection of stray light off an internal surface of the first optic or an external surface of the first optic, or combinations thereof, and an angle of the surface of the second wedge optic having the reflective surface are selected to allow reflection of the stray light off the reflective surface.

17. An information handling system, comprising:

a processor and a memory coupled to the processor; and

scanned beam display coupled to the processor to project an image at least temporarily stored within the memory, the scanned beam display comprising;

a light source to generate a light beam;

a scanning platform to receive the light beam and to scan the light beam as a projected image;

first and second optics, wherein the first optic directs the light beam onto the scanning platform to be reflected through the second optic as the projected image; and

a reflective surface disposed on at least one of the first optic or the second optic to reflect stray light away from the projected image.

18. An information handling system as claimed in claim 17, wherein the reflective surface comprises a total internal reflection surface.

19. An information handling system as claimed in claim 17, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic.

20. An information handling system as claimed in claim 17, wherein the first optic or the second optic, or combinations thereof, comprise a wedge optic, wherein the reflective surface is disposed on a surface of the second optic to redirect a stray light beam reflected off an internal surface of the first optic.