Method, System and Apparatus for Diffuser Vibration

• US 20080088804A1
• Filed: 10/12/2007
• Published: 04/17/2008
• Est. Priority Date: 10/13/2006
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Myers, Denise, Peterson, Mark, Loomis, Dan, Tangen, Kyrre
• Application Number:
  US11/871,951
• Publication Number:
  US 20080088804A1
• Time in Patent Office: Days
• US Class Current: 353/69
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G03B 21/14 Details
• CPC Class Codes: G03B 21/208 Homogenising, shaping of the illumination light
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing

Abstract

Methods, systems and apparatus for diffuser vibration to reduce speckle in a laser display device are provided. In some embodiments, a coil is operatively coupled to the diffuser to generate the desired vibrations in the diffuser. In some embodiments, an air jet may be operatively coupled to the diffuser such that vibrations from the air jet are transferred to the diffuser. In other embodiments, parasitic vibrations from other components in the laser display device may be used to vibrate the diffuser without requiring an additional motor dedicated to only vibrating the diffuser.

Claims

1. An image display device, comprising:

a laser light source to provide a laser light to an imaging device, wherein the laser light is configured to project at least a portion of an image from the display device onto a surface;

optics in an optical path of the laser light, the optics to optically adjust the laser light;

a diffuser in the optical path of the laser light between the laser light source and the imaging device; and

a coil connected to the diffuser, wherein the diffuser is vibrated by a change in electrical current through the coil, and the diffuser is configured to diffuse the laser light and reduce speckle in the image.

2. The image display device of claim 1, wherein the coil is a speaker driver.

3. The image display device of claim 1, wherein the coil is within an optical pickup head.

4. The image display device of claim 1, wherein the coil is a portion of a fan assembly used to cool the image display device.

5. The image display device of claim 1, wherein the coil is used to vibrate the diffuser and power at least one other function for the display device.

6. The image display device of claim 1, wherein the diffuser is vibrated at a frequency of at least 60 Hertz.

7. An image display device, comprising:

a laser light source to provide a laser light to an imaging device, wherein the laser light is configured to project at least a portion of an image from the display device onto a surface;

optics in an optical path of the laser light, the optics to optically adjust the laser light;

a diffuser in the optical path of the laser light between the laser light source and the imaging device; and

a parasitic vibration arm connected to the diffuser, wherein the parasitic vibration arm is vibrated by an air jet, the diffuser is vibrated by the parasitic vibration arm, and the diffuser is configured to diffuse the laser light and reduce speckle in the image.

8. The image display device of claim 7, wherein the diffuser is vibrated at a frequency of at least 60 Hertz.

9. A method for reducing speckle in a laser display device, the method comprising:

providing a laser light to an imaging device to then project at least part of an image from a display device;

adjusting the laser light with optics in the path of the laser light within the display device;

vibrating a diffuser within the path of the laser between a laser light source and the imaging device light to reduce speckle in the image projected from the display device, wherein vibrating the diffuser further comprises electrically moving a coil attached to the diffuser.

10. The method of claim 9, further comprising vibrating the diffuser at a frequency of at least 60 Hertz.

11. The method of claim 9, wherein the coil is a speaker driver.

12. The method of claim 9, wherein the coil is within an optical pickup head.

13. The method of claim 9, wherein the coil is a portion of a fan assembly used to cool the image display device.

14. The method of claim 9, further comprising vibrating the diffuser with the coil, and using the coil to power at least one other function for the display device.

15. A method for reducing speckle in a laser display device, the method comprising:

providing a laser light to an imaging device to project at least part of an image from a display device;

adjusting the laser light with optics in the path of the laser light within the display device;

vibrating a diffuser within the path of the laser light between a laser light source and the imaging device to reduce speckle in the image projected from the display device, wherein vibrating the diffuser further comprises imparting an air jet on structure attached to the diffuser.

16. The method of claim 15, further comprising vibrating the diffuser at a frequency of at least 60 Hertz.