LED MOSAIC

• US 20080036972A1
• Filed: 07/31/2007
• Published: 02/14/2008
• Est. Priority Date: 07/31/2006
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Phillips, William, Grace, Jennifer
• Application Number:
  US11/831,198
• Publication Number:
  US 20080036972A1
• Time in Patent Office: Days
• US Class Current: 353/31
• CPC Class Codes: G03B 21/00 Projectors or projection-type viewers; Accessories therefor devices for changing pictures G03B23/00

Abstract

An illumination system for illuminating a target area includes an LED source, a collection lens that collects light from the LED source, and an image-forming device positioned at the target area. The LED source includes a mosaic of LED dies forming a footprint of at least two different colors.

Claims

1. An illumination system for illuminating a target area, the system comprising:

an LED source that includes a mosaic of LED dies forming a footprint, the footprint being divided into four quadrants about a vertical centerline and a horizontal centerline, wherein for at least two quadrants, there are at least two different colors of LED dies in the at least two quadrants;

a collection lens that collects light from the LED source; and

an image-forming device that receives light from the LED source at the target area.

2. The system of claim 1, wherein the at least two quadrants are diagonal from one another.

3. The system of claim 1, wherein the at least two quadrants include at least three different colors of LED dies.

4. The system of claim 1, wherein the footprint has an aspect ratio that substantially matches an aspect ratio of the target area.

5. The system of claim 1, wherein the LED dies have at least two different sizes.

6. The system of claim 5, wherein the LED dies have three different sizes for three different colors.

7. The system of claim 1, wherein the LED dies include at least three dies that emit light of different colors.

8. The system of claim 7, wherein the different colors include red, green and blue.

9. The system of claim 1, wherein the system provides sequential illumination.

10. The system of claim 1, wherein the system provides non-sequential illumination.

11. The projection system of claim 1, wherein the image-forming device a liquid crystal on silicon device.

12. The system of claim 1, and further comprising a projection lens assembly receiving an image from the image-forming device.

13. The system of claim 1 wherein the mosaic is symmetric about at least one of the vertical centerline and the horizontal centerline.

14. The system of claim 1 wherein the mosaic is asymmetric about at least one of the vertical centerline and the horizontal centerline.

15. The system of claim 1 wherein the mosaic is symmetric about an axis positioned at an intersection of the vertical centerline and the horizontal centerline.

16. The system of claim 1 wherein the mosaic includes at least five dies.

17. The system of claim 16 wherein the mosaic includes at least two dies for each of three different colors.