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

• US 20080055705A1
• Filed: 10/26/2007
• Published: 03/06/2008
• 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 7,542,198 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. A method of providing an electrical signal to a plurality of optical elements of a display, the optical elements individually actuatable by applying a voltage thereto, the method comprising:

electrically coupling an electrically-conductive mask to one or more optical elements; and

applying a voltage to the mask to activate the one or more optical elements.

2. The method of claim 1, wherein the one or more optical elements comprise interferometric modulators.

3. The method of claim 1, wherein the mask is light-absorbing.

4. The method of claim 1, wherein the mask comprises a film stack.

5. The method of claim 4, wherein the film stack comprises a conductive reflective layer to which a voltage is applied to activate the one or more optical elements.

6. The method of claim 4, wherein the film stack comprises a first reflective layer and a second reflective layer.

7. The method of claim 4, wherein the film stack comprises a non-light-absorbing dielectric material sandwiched between two light-reflecting materials.

8. The method of claim 6, wherein electrically coupling an electrically-conductive mask to one or more optical elements comprises electrically coupling the first reflective layer to a first electrode of the one or more optical elements and electrically coupling the second reflective layer to a second electrode of the one or more optical elements.

9. The method of claim 7, wherein one or more of the light-reflecting materials comprises silver, aluminum, or chromium.

10. The method of claim 1, wherein the mask comprises one or more interferometric modulators.

11. The method of claim 1, wherein the mask is configured to appear black.

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

13. The method of claim 1, further comprising electrically coupling a column electrode to the mask, and wherein applying a voltage to the mask to activate the one or more optical elements comprises applying a voltage to the mask through the column electrode.

14. The method of claim 1, further comprising electrically coupling a row electrode to the mask, and wherein applying a voltage to the mask to activate the one or more optical elements comprises applying a voltage to the mask through the row electrode.

15. The method of claim 1, wherein the mask is electrically coupled to the one or more optical elements by one or more conductive vias.

16. The method of claim 1, wherein the mask is stationary.

17. The method of claim 16, wherein the one or more optical elements comprise interferometric modulators.

18. A method of providing an electrical signal to a plurality of light modulating elements of a display, the modulating elements individually actuatable by applying a voltage thereto, the light modulating elements having an optical characteristic which changes in response to a voltage applied to the modulating element, the method comprising:

disposing an electrically conductive mask on the substrate masking a portion of a plurality of the light modulating elements;

electrically coupling the electrically-conductive mask to the plurality of light modulating elements to provide one or more electrical paths for applying voltages to the plurality of light modulating elements; and

applying a voltage to the mask to activate one or more of the plurality of light modulating elements.

19. The method of claim 18, wherein one or more of the light modulating elements comprise interferometric modulators.

20. The method of claim 18, wherein the mask comprises a film stack comprising a conductive reflective layer to which a voltage is applied to activate at least some of the plurality of light modulating elements.

21. The method of claim 18, wherein at least some of the plurality of light modulating elements comprise 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 at least some of the plurality of light modulating elements and lets light pass to at least a portion of an active area of at least some of the plurality of light modulating elements.

22. A method of fabricating an optical device, the method comprising:

forming an electrically-conductive optical mask on a substrate, wherein the optical mask absorbs light;

forming an optical component on the substrate spaced from the optical mask, wherein the optical component has a driven state and an undriven state, the optical component changing between the driven state and the undriven state in response to an applied voltage, each state having a characteristic optical response to incident light; and

electrically connecting the optical mask to the optical component so at least a portion of the optical mask provides a bus for applying the voltage to the optical component.

23. A method of fabricating an optical device comprising at least one active optical component formed on a transparent substrate, the method comprising:

identifying an area on the substrate that is to be light-absorbing wherein the identified area is laterally offset from the at least one active optical component; and

fabricating a conductive light-absorbing mask on the identified area prior to fabricating the at least one active optical component, wherein the mask is connected to the active optical component.

24. The method of claim 23, wherein the optical component comprises a pixel, the light-absorbing area being an area bordering the pixel.

25. An optical device produced by a process comprising:

identifying an area on the substrate that is to be light-absorbing wherein the identified area is laterally offset from the at least one active optical component; and

fabricating a conductive light-absorbing mask on the identified area prior to fabricating the at least one active optical component, wherein the mask is connected to the active optical component.