Method and system for reducing speckle by vibrating a line generating element

• US 8,059,340 B2
• Filed: 12/20/2007
• Issued: 11/15/2011
• Est. Priority Date: 08/01/2007
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Krycho, Steven Paul, Khan, Sajjad A.
• Primary Examiner(s): Harrington; Alicia M
• Application Number:
  US11/961,841
• Publication Number:
  US 20090034037A1
• Time in Patent Office: 1,426 Days
• Field of Search: 359/599, 359/618, 359/619, 359/620, 359/623, 359/710
• US Class Current: 359/619
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129

Abstract

Provided is a method and system for reducing speckle in an image produced from a light source. The method, in one embodiment, includes providing a line generating element, the line generating element having a collection of optical elements having an axis. The method, in this embodiment, further includes directing an input beam of light at the line generating element while the line generating element is being vibrated back and forth in a direction substantially transverse to the axis.

Claims

1. A system for reducing speckle in an image produced from a light source, comprising:

a light source operable to transmit an input beam of light;

a line generating element in optical communication with the input beam of light, the line generating element having a collection of optical elements configured to convert the input beam of light into one or more individual line beams of light;

a vibration source coupled to the line generating element, the vibration source configured to vibrate the line generating element back and forth in a direction substantially transverse to an axis of the collection of optical elements;

a spatial light modulator positioned in optical communication with the line generating element, the spatial light modulator configured to modulate the one or more individual line beams of light; and

a display screen positioned to receive the modulated individual line beams of light.

2. The system of claim 1 wherein the collection of optical elements has a fixed pitch, and wherein the vibration source is configured to vibrate the line generating element a distance equal to at least about the fixed pitch.

3. The system of claim 2 wherein the vibration source is configured to vibrate the line generating element at a speed such that an amount of time it takes for the line generating element to travel the distance is equal to or less than about 16.67 milliseconds.

4. The system of claim 1 wherein a layer of material having diffusive properties is located in contact with the line generating element.

5. The system of claim 1 wherein the spatial light modulator includes an array of digital micromirror devices.

6. The system of claim 1, further including an RGB scrolling mechanism configured to scroll the individual line beams of light across the spatial light modulator in temporal sequence.

7. The system of claim 1 wherein the collection of optical elements are substantially parallel to one another.

8. The system of claim 1 wherein the collection of optical elements are not substantially parallel to one another.

9. A system for reducing speckle in an image produced from a light source, comprising:

a light source operable to transmit an input beam of light;

a line generating element in optical communication with the input beam of light, the line generating element having a collection of optical elements configured to convert the input beam of light into one or more individual line beams of light;

a vibration source coupled to the line generating element, the vibration source configured to vibrate the line generating element back and forth in a direction substantially transverse to an axis of the collection of optical elements;

a spatial light modulator positioned in optical communication with the line generating element, the spatial light modulator configured to modulate the one or more individual line beams of light;

a display screen positioned to receive the modulated individual line beams of light; and

a second vibration source configured to vibrate the display screen.