Interconnect structure for MEMS device

• US 7,916,980 B2
• Filed: 01/13/2006
• Issued: 03/29/2011
• Est. Priority Date: 01/13/2006
• Status: Active Grant

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Lasiter, Jon Bradley
• Primary Examiner(s): Le; Uyen-Chau N
• Assistant Examiner(s): TRAN, HOANG Q
• Application Number:
  US11/331,705
• Publication Number:
  US 20070189654A1
• Time in Patent Office: 1,901 Days
• Field of Search: 385/1
• US Class Current: 385/1
• 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

An interferometric modulator array is formed with connectors and/or an encapsulation layer with electrical connections. The encapsulation layer hermetically seals the array. Circuitry may also be formed over the array.

Claims

1. An interferometric display device, comprising:

a transmissive substrate;

a plurality of individually addressable interferometric light modulators on the substrate, each modulator comprising

a first electrode;

a second electrode;

a conductive connector connected to the first electrode and configured to connect to an external device to control said modulator through said connector;

at least one of a diode, a transistor, and a zener diode, wherein each of the at least one diode, a transistor, and a zener diode is connected to the first electrode and the connector and disposed therebetween; and

a cavity between the first and second electrode, wherein the cavity is configured to interferometrically modulate incident light transmitted through the substrate, and wherein the cavity has a variable height dependent on a voltage potential applied between the first and second electrodes.

2. The interferometric display device of claim 1, wherein the plurality of modulators comprise at least 90 percent of the interferometric modulators in an array of interferometric modulators.

3. The interferometric display device of claim 1, wherein the connectors of the modulators collectively comprise a plurality of connector bumps.

4. The interferometric display device of claim 3, wherein the connector bumps are arranged with a pitch between about 40 microns and about 60 microns.

5. The interferometric display device of claim 1, wherein each modulator further comprises at least one of a capacitor and an inductor.

6. The interferometric display device of claim 1, wherein each modulator comprises at least one support configured to define a spacing between the modulator and the connector.

7. The device of claim 1, wherein each modulator further comprises:

a partially light-reflecting electrode;

a movable electrode defining the cavity of the modulator with the first electrode; and

at least one first support between the partially light-reflecting electrode and the movable electrode.

8. The device of claim 1, wherein each modulator is characterized by at least two states and wherein the connector is configured to conduct a signal to control the state of the modulator associated with the connector.

9. The device of claim 1, further comprising:

a display comprising the interferometric display device;

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.

10. The device of claim 1, further comprising a driver circuit configured to send at least one signal to the display.

11. The device of claim 10, further comprising a controller configured to send at least a portion of the image data to the driver circuit.

12. The device of claim 1, further comprising an image source module configured to send said image data to said processor.

13. The device of claim 1, further comprising an input device configured to receive input data and to communicate said input data to said processor.

14. The device of claim 12, wherein the image source module comprises at least one of a receiver, transceiver, and transmitter.

18. The interferometric display device of claim 1, wherein the interferometric modulator comprises an electrode is moveable with respect to the substrate and the connector is electrically connected to the first electrode.

20. The interferometric display device of claim 1, wherein each connecter is located farther from the substrate than the modulator.

15. A device comprising:

a substrate;

a plurality of individually addressable means for interferometrically modulating incident light on the substrate, each modulating means comprising

a first electrode; and

a second electrode;

conductive connecting means for connecting a single one of the modulating means to an external device so that each single one of the plurality of modulating means is individually controllable by the external device through said connector;

at least one of a diode, a transistor, and a zener diode, wherein each of the at least one diode, a transistor, and a zener diode connected to the first electrode and the connecting means and disposed therebetween; and

a cavity between the first and second electrode, wherein the cavity is configured to interferometricall modulate incident light transmitted through the substrate, and wherein the cavity has a variable height dependent on a voltage potential applied between the first and second electrodes.

16. The device of claim 15, wherein the connecting means comprises one of a capacitor and an inductor.

17. The device of claim 15, wherein the means for actively controlling comprises a means for applying a voltage to an electrode of the modulating means.

19. The interferometric display device of claim 15, wherein the modulating means comprises an electrode is moveable with respect to the supporting means and the connecting means is electrically connected to the first electrode.

21. The interferometric display device of claim 15, wherein each connecting means is located farther from the supporting means than the first electrode.