DEVICE HAVING A CONDUCTIVE LIGHT ABSORBING MASK AND METHOD FOR FABRICATING SAME

• US 20090201566A1
• Filed: 04/17/2009
• Published: 08/13/2009
• Est. Priority Date: 09/27/2004
• Status: Active Grant

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: IDC, LLC
• Inventors: Kothari, Manish
• Granted Patent: US 7,889,415 B2
• Time in Patent Office: Days
• US Class Current: 359/290
• CPC Class Codes: G02B 26/00 Optical devices or arrangements for the control of light using movable or deformable optical elements control of light by modification of the optical properties of the media of the elements involved therein G02F1/00
• 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 26/0841 the reflecting element being moved or deformed by electrostatic means
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

A system and method for an optical component that masks non-active portions of a display and provides an electrical path for one or more display circuits. In one embodiment an optical device includes a substrate, a plurality of optical elements on the substrate, each optical element having an optical characteristic which changes in response to a voltage applied to the optical element, and a light-absorbing, electrically-conductive optical mask disposed on the substrate and offset from the plurality of optical elements, the optical mask electrically coupled to one or more of the optical elements to provide electrical paths for applying voltages to the optical elements. In another embodiment, a method of providing an electrical signal to optical elements of a display comprises electrically coupling an electrically-conductive light-absorbing mask to one or more optical elements, and applying a voltage to the mask to activate the one or more optical elements.

Claims

1. An optical device comprising:

a substrate;

a light modulating element disposed on the substrate, the modulating element comprising a movable reflective layer and a non-movable partially reflective layer, the movable layer configured to move between a driven state and an undriven state in response to a voltage applied to the modulating element; and

an electrically-conductive mask disposed on a portion of the substrate to mask a portion of the light modulating element and electrically coupled to the modulating element to provide one or more electrical paths for applying voltages to the modulating element, the mask comprising a non-movable reflective layer, a non-movable partially reflective layer, and an interferometric cavity defined by the reflective layer and the partially reflective layer.

2. The device of claim 1, wherein the modulating element comprises a non-active area and an active area, and wherein the mask blocks light from at least a portion of the non-active area of the modulating element and lets light pass to at least a portion of the active area of the modulating element.

3. The device of claim 2, wherein the non-active area comprises a portion of the light modulating element that is not used to display data.

4. The device of claim 2, wherein the movable reflective layer is disposed in the active area of the modulating element.

5. The device of claim 4, wherein the non-active area includes at least a portion of the modulating element other than the area corresponding to the movable reflective layer.

6. The device of claim 4, wherein the mask is disposed to absorb light in an area of the modulating element other than the area corresponding to the movable reflective layer.

7. The device of claim 1, wherein the mask is configured to appear black.

8. The device of claim 1, wherein the mask is configured to appear a color other than black.

9. The device of claim 1, wherein the mask is electrically coupled to the modulating element by one or more conductive vias.

10. The device of claim 1, wherein the mask comprises a non-light-absorbing dielectric material sandwiched between the two reflective layers.

11. The device of claim 10, wherein the non-movable reflective layer of the mask is electrically connected to a first electrode and the non-movable partially reflective layer of the mask is electrically connected to a second electrode.

12. The device of claim 10, wherein one or more of the reflective layers of the mask comprises silver, aluminum, or chromium.

13. The device of claim 1, further comprising:

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

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

14. The device of claim 13, further comprising a driver circuit configured to send at least one signal to said light modulating element.

15. The device of claim 14, further comprising a controller configured to send at least a portion of said image data to said driver circuit.

16. The device of claim 13, further comprising an image source module configured to send said image data to said processor.

17. The device of claim 16, wherein said image source module comprises at least one of a receiver, transceiver, and transmitter.

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

19. An optical device comprising:

a substrate;

an interferometric modulator disposed on the substrate, the modulator comprising a movable reflective layer which moves in response to a voltage applied to the modulator; and

electrically-conductive means disposed on the substrate for masking a portion of the modulator from reflecting light, the masking means comprising a non-movable first reflective layer and a non-movable second reflective layer, the masking means being electrically coupled to the modulator to provide one or more electrical paths for applying voltages to the modulator.

20. The device of claim 19, wherein the reflective layers of the masking means are configured to interferometrically modulate light.

21. The device of claim 19, wherein the modulator comprises a non-active area and an active area, and wherein the masking means blocks light from at least a portion of the non-active area of the modulator and lets light pass to at least a portion of the active area of the modulator.

22. The device of claim 21, wherein the non-active area comprises a portion of the modulator that is not used to display data.

23. The device of claim 21, wherein the movable reflective layer is in the active area of the modulator.

24. The device of claim 23, wherein the non-active area includes at least a portion of the modulator other than the area corresponding to the movable reflective layer.

25. The device of claim 23, wherein the masking means is disposed to absorb light in an area of the modulator other than the area corresponding to the movable reflective layer.

26. The device of claim 19, wherein the masking means is configured to appear black.

27. The device of claim 19, wherein the masking means is configured to appear a color other than black.

28. The device of claim 19, wherein the masking means comprises a non-light-absorbing dielectric material sandwiched between the two reflective layers.

29. The device of claim 28, wherein the non-movable first reflective layer is electrically connected to a first electrode and the non-movable second reflective layer is electrically connected to a second electrode.

30. The device of claim 28, wherein one or more of the reflective layers of the masking means comprises silver, aluminum, or chromium.

31. An optical device comprising:

an interferometric modulator disposed on a substrate, the modulator comprising a movable reflective layer configured to move between a driven state and an undriven state in response to an applied voltage;

electrically-conductive means for masking a portion of the interferometric modulator, the masking means comprising a non-movable first reflective layer and a non-movable second reflective layer configured to interferometrically modulate light; and

means for electrically connecting the masking means to the modulator so at least a portion of the masking means provides an electrical bus for applying voltage to the modulator.