High profile contacts for microelectromechanical systems

• US 20080043315A1
• Filed: 08/15/2006
• Published: 02/21/2008
• Est. Priority Date: 08/15/2006
• Status: Abandoned Application

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Inventors: Cummings, William J.
• Application Number:
  US11/504,319
• Publication Number:
  US 20080043315A1
• Time in Patent Office: Days
• US Class Current: 359/290
• CPC Class Codes: B81B 7/0006 Interconnects
• 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

Abstract

In certain embodiments, an interferometric modulator includes a substrate, a first electrode layer over the substrate, and a second electrode layer over the first electrode layer. The second electrode layer includes a first portion and a second portion. The first portion of the second electrode layer is configured to move between a relaxed position spaced away from the first electrode layer and an actuated position spaced closer to the first electrode layer than is the relaxed position. The second portion of the second electrode layer includes at least one electrical contact having an end extending generally away from the substrate.

Claims

1. An apparatus comprising:

a substrate;

a first electrode layer over the substrate; and

a second electrode layer over the first electrode layer,

wherein the second electrode layer comprises a first portion and a second portion, the first portion of the second electrode layer configured to move between a relaxed position spaced away from the first electrode layer and an actuated position spaced closer to the first electrode layer than is the relaxed position, the second portion of the second electrode layer comprising at least one electrical contact having an end extending generally away from the substrate.

2. The apparatus of claim 1, wherein the at least one electrical contact has a width along a direction substantially parallel to the substrate that is smaller than a distance between the substrate and the end of the electrical contact.

3. The apparatus of claim 1, wherein the at least one electrical contact is cantilevered over the substrate.

4. The apparatus of claim 3, wherein the at least one electrical contact is cantilevered from a post.

5. The apparatus of claim 1, wherein the second electrode layer comprises aluminum or nickel.

6. The apparatus of claim 1, wherein the second electrode layer comprises a first layer and a second layer.

7. The apparatus of claim 6, wherein the first layer has a compressive internal stress and the second layer has a tensile internal stress, the first and second layers cooperating to bend the one or more electrical contacts away from the substrate.

8. The apparatus of claim 6, wherein at least one of the first layer and the second layer comprises nickel and the other of the first layer and the second layer comprises aluminum.

9. The apparatus of claim 1, wherein the at least one electrical contact is configured to contact a driver chip mountable on the substrate.

10. The apparatus of claim 9, wherein the at least one electrical contact comprises two or more electrical contacts that are configured to contact a single lead of the driver chip.

11. The apparatus of claim 10, wherein the two or more electrical contacts are substantially parallel to each other.

12. The apparatus of claim 1, wherein the at least one electrical contact is flexible.

13. The apparatus of claim 12, wherein the at least one electrical contact is configured to bend toward the substrate due to contact with an electrical lead.

14. The apparatus of claim 1, wherein the end of the at least one electrical contact is between about 5 microns and about 25 microns from the substrate.

15. The apparatus of claim 1, further comprising:

a display;

a processor that is configured to communicate with said display, said processor being configured to process image data; and

a memory device that is configured to communicate with said processor.

16. The apparatus of claim 15, further comprising a driver circuit configured to send at least one signal to the display.

17. The apparatus of claim 16, further comprising a controller configured to send at least a portion of the image data to the driver circuit.

18. The apparatus of claim 15, further comprising an image source module configured to send said image data to said processor.

19. The apparatus of claim 18, wherein the image source module comprises at least one of a receiver, transceiver, and transmitter.

20. The apparatus of claim 15, further comprising an input device configured to receive input data and to communicate said input data to said processor.

21. An apparatus comprising:

means for supporting the apparatus;

first means for applying a voltage to the apparatus, the first applying means over the supporting means;

second means for applying a voltage to the apparatus, the second applying means over the first applying means; and

means for transmitting an electrical signal to the second applying means, the transmitting means having an end extending generally away from the supporting means, wherein the transmitting means and the second applying means are both portions of a common layer.

22. The apparatus of claim 21, wherein the second applying means is configured to move a portion of the apparatus between a relaxed position spaced away from the first applying means and an actuated position spaced closer to the first applying means than is the relaxed position.

23. The apparatus of claim 21, wherein the supporting means comprises a substrate.

24. The apparatus of claim 21, wherein the first applying means comprises an electrode layer.

25. The apparatus of claim 21, wherein the second applying means comprises a first portion of an electrode layer and the transmitting means comprises a second portion of the electrode layer.

26. A method of fabricating a microelectromechanical systems (MEMS) device, comprising:

forming an electrode layer over a first portion of a substrate;

forming a first sacrificial layer over the electrode layer,

forming a second sacrificial layer over a second portion of the substrate;

forming a metal layer over the first sacrificial layer and over the second sacrificial layer;

removing the first sacrificial layer to create a gap between the metal layer and the electrode layer; and

removing the second sacrificial layer to allow a portion of the metal layer over the second portion of the substrate to bend away from the substrate.

27. The method of claim 26, wherein the second sacrificial layer comprises a material different from the first sacrificial layer.

28. The method of claim 27, wherein at least one of the first sacrificial layer and the second sacrificial layer comprises molybdenum and the other of the first sacrificial layer and the second sacrificial layer comprises a photoresist material.

29. The method of claim 26, wherein forming the first sacrificial layer and forming the second sacrificial layer are performed separately.

30. The method of claim 26, wherein forming the first sacrificial layer and forming the second sacrificial layer are performed concurrently.

31. The method of claim 26, wherein the removing the first sacrificial layer and removing the second sacrificial layer are performed separately.

32. The method of claim 31, wherein removing the second sacrificial layer is performed after removing the first sacrificial layer and before mounting a driver chip to the substrate.

33. The method of claim 26, wherein the removing the first sacrificial layer and removing the second sacrificial layer are performed concurrently.

34. The method of claim 26, wherein removing the first sacrificial layer comprises exposing the first sacrificial layer to xenon difluoride gas.

35. The method of claim 34, wherein removing the second sacrificial layer comprises exposing the second sacrificial layer to a plasma dry etch comprising O₂ gas, SF₆ gas, CH₄ gas, or N₂ gas, or a combination thereof.

36. The method of claim 26, wherein the metal layer is a unitary piece of material over the first portion and the second portion of the substrate.

37. The method of claim 26, further comprising contacting a driver chip to the portion of the metal layer bent away from the substrate.

38. The method of claim 37, wherein the portion of the metal layer bent away from the substrate comprises two or more electrical contacts.

39. The method of claim 26, wherein forming the metal layer comprises forming a first layer of the metal layer over a second layer of the metal layer.

40. The method of claim 26, further comprising plating additional metal on the portion of the metal layer bent away from the substrate.

41. A MEMS device fabricated by the method of claim 26.