System and method for reducing visual artifacts in displays

• US 8,107,155 B2
• Filed: 10/06/2006
• Issued: 01/31/2012
• Est. Priority Date: 10/06/2006
• Status: Expired due to Fees

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Bita, Ion, Xu, Gang, Mienko, Mark, Gruhlke, Russell Wayne
• Primary Examiner(s): Ben, Loha
• Application Number:
  US11/545,104
• Publication Number:
  US 20080084600A1
• Time in Patent Office: 1,943 Days
• Field of Search: 359290-295, 359/618, 359/577, 359/298, 359/561, 359/621, 353/46, 353/69, 353/81, 348/744, 348/752, 348/E5.137, 356/511, 356/521, 356/35.5, 356/486, 372/39, 372/92, 345/694, 345/699, 250/201.1, 250/201.9, 250/208.1, 358/296, 358/505, 385/129, 385/146, 349 62- 65, 349/67
• US Class Current: 359/290
• CPC Class Codes: G02B 26/001 based on interference in an adjustable optical cavity interference filters G02B5/28; devices or arrangements using multiple reflections in spectrometry or monochromators G01J3/26
• CPC Class Codes: G02B 6/0035 provided on the surface of the light guide or in the bulk of it
• CPC Class Codes: G02B 6/0058 varying in density, size, shape or depth along the light guide

Abstract

Embodiments include systems and methods for reducing visible artifacts such as Moiré, or interference, patterns, in displays. One embodiment includes a display device comprising a plurality of light modulators and a plurality of illumination elements configured to direct light to the light modulators. The directed light of the plurality of illumination elements collectively defines an nonuniformly varying pattern of light.

Claims

1. A display device, comprising:

a plurality of light modulators disposed on a substrate; and

a plurality of illumination elements formed substantially along a plane and configured to extract light from a light guide, and to transform the extracted light into a non-uniformly varying pattern of light, the plurality of illumination elements being further configured to direct the non-uniformly varying pattern of light to the light modulators, wherein each of the illumination elements comprises at least one surface defining an angle with respect to the substrate and wherein each of said surfaces is configured to direct the non-uniformly varying pattern of light to at least one of said light modulators.

2. The device of claim 1, further comprising a light source configured to provide light to the plurality of illumination elements.

3. The device of claim 1, wherein the surfaces of at least two of the illumination elements define different angles with respect to the substrate.

4. The device of claim 1, wherein the illumination elements are arranged in a non-uniform pattern.

5. The device of claim 4, wherein each of the illumination elements is positioned adjacent to at least one other of the illumination elements and each of the illumination elements is positioned at a non-uniform offset from said at least one other of the illumination elements.

6. The device of claim 5, wherein said offset comprises an offset in two dimensions.

7. The device of claim 5, wherein at least two of the illumination elements have different sizes.

8. The device of claim 4, wherein the illumination elements are arranged in a plurality of lines and wherein the lines are non-parallel to each other.

9. The device of claim 8, wherein each of the lines has a midpoint, and wherein the midpoints of the lines are arranged non-uniformly within the plurality of illumination elements.

10. The device of claim 1, wherein light modulators comprise interferometric light modulators.

11. The device of claim 1, further comprising:

a processor that is in electrical communication with said light modulators, said processor being configured to process image data;

a memory device in electrical communication with said processor.

12. The device of claim 11, further comprising a driver circuit configured to send at least one signal to said light modulators.

13. The device of claim 12, further comprising a controller configured to send at least a portion of said image data to said driver circuit.

14. The device of claim 11, further comprising an image source module configured to send said image data to said processor.

15. The device of claim 14, wherein said image source module comprises at least one of a receiver, transceiver, and transmitter.

16. The device of claim 11, further comprising an input device configured to receive input data and to communicate said input data to said processor.

17. A display device comprising:

a plurality of light modulators; and

a plurality of illumination elements arranged in a plurality of lines, each line of the plurality of lines being disposed at a non-uniform offset from each adjacent line of the plurality of lines, the illumination elements configured to direct light to the light modulators.

18. A display device comprising:

a plurality of light modulators; and

a plurality of discontinuous illumination elements arranged along a series of lines and configured to direct light to the light modulators, wherein each of the plurality of discontinuous illumination elements is arranged along, and offset from, one of the series of lines and wherein the series of lines is formed substantially in a plane.

19. A display device comprising:

a plurality of interferometric modulators disposed on a substrate and configured for modulating light; and

a plurality of illumination elements configured for extracting light from a light guide, for transforming the extracted light into a non-uniformly varying pattern of light and for illuminating the interferometric modulators with the non-uniformly varying pattern of light.

20. The device of claim 19, wherein the plurality of illumination elements comprises means for reflecting light.

21. The device of claim 19, wherein each of the illumination elements comprises a surface defining an angle with respect to the substrate, wherein each of said surfaces is configured to direct light to said interferometric modulators.

22. A method of making an illuminator, the method comprising:

forming a plurality of illumination elements substantially along a plane, the illumination elements configured to extract light from a light guide, to transform the extracted light into a non-uniformly varying pattern of light and to direct the non-uniformly varying pattern of light to an array of light modulators.

23. The device of claim 22, further comprising forming the array of light modulators on a substrate.

24. The device of claim 23, wherein forming the plurality of illumination elements comprises forming the plurality illumination elements above the substrate.

25. The device of claim 22, wherein forming each of the plurality of illumination elements comprises forming at least one surface configured to direct the non-uniformly varying pattern of light onto at least one light modulator in the array of light modulators.

26. The device of claim 25, wherein the surfaces of at least two of the illumination elements define different angles with respect to a substrate on which the light modulators are formed.

27. The device of claim 22, wherein the illumination elements are arranged in a non-uniform pattern.

28. The device of claim 27, wherein each of the illumination elements is formed at a position adjacent to at least one other of the illumination elements and each of the illumination elements is formed at a position at a non-uniform offset from said at least one other of the illumination elements.

29. The device of claim 27, wherein the illumination elements are arranged in a plurality of lines and wherein the lines are non-parallel to each other.

30. The device of claim 29, wherein each of the lines has a midpoint, and wherein the midpoints of the lines are arranged non-uniformly within the plurality of illumination elements.

31. The device of claim 22, wherein the light modulators comprise interferometric light modulators.

32. A method, comprising:

illuminating a plurality of illumination elements with light;

directing a non-uniformly varying pattern of the light formed from the illumination elements to a plurality of interferometric light modulators; and

interferometrically modulating the non-uniformly varying pattern of light with the interferometric light modulators.

33. The method of claim 32, further comprising disposing the plurality of light modulators on a substrate, wherein each of the illumination elements comprises at least one surface defining an angle with respect to the substrate and wherein each of said surfaces is configured to direct the non-uniformly varying pattern of light to at least one of said light modulators.

34. The method of claim 32, wherein the illumination elements are arranged in a non-uniform pattern.