Interferometric modulators having charge persistence
First Claim
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1. An electromechanical interferometric device comprising:
- means for altering a state of the device, the state being based on an actuation threshold; and
means for shifting the actuation threshold to one of a plurality of functional differentiatable actuation thresholds by actuating the device, wherein the actuation threshold shifting means comprises a driving circuit.
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Abstract
An iterferometric modulator is formed having a dielectric with charge persistence. The interferometric modulator is addressed by a method making advantageous use of the charge persistence property, wherein the interferometric modulator is pre-charged in such a way that the pre-charging is not observable to a viewer, and the actuation voltage threshold of the imod is significantly lowered. Subsequently the interferometric modulator may be actuated with a significantly lower actuation voltage, thereby saving power.
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Citations
19 Claims
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1. An electromechanical interferometric device comprising:
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means for altering a state of the device, the state being based on an actuation threshold; and means for shifting the actuation threshold to one of a plurality of functional differentiatable actuation thresholds by actuating the device, wherein the actuation threshold shifting means comprises a driving circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electromechanical device comprising:
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an electrode; a dielectric layer coupled to the electrode, the dielectric layer comprising at least a substantially trappy surface; and a movable reflective layer extending over the surface of the dielectric layer so as to form a cavity therebetween, the movable reflective layer being configured to contact the dielectric if an electrical potential between the electrode and at least a portion of the movable reflective layer is greater than an actuation threshold, wherein when the movable reflective layer contacts the dielectric layer charge is transferred between the movable reflective layer and the dielectric layer to significantly change the actuation threshold, wherein the device comprises an interferometric light modulator configured to be connected to additional interferometric light modulators of an array. - View Dependent Claims (11, 12, 13)
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14. An electromechanical interferometric device comprising:
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means for altering a state of the device, the state being based on an actuation threshold; means for significantly altering the actuation threshold to one of a plurality of functional differentiatable actuation thresholds by actuating the device; means for modulating light; and means for connecting the device to additional light modulating means of an array. - View Dependent Claims (15, 16)
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17. A method of manufacturing an electromechanical interferometric device, the method comprising:
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forming an electrode; forming a dielectric layer comprising at least a substantially trappy surface, the dielectric layer being coupled to the electrode; forming a movable reflective layer over the dielectric layer so as to establish a cavity therebetween, the movable reflective layer being configured to contact the dielectric layer if an electrical potential between the electrode and at least a portion of the movable reflective layer is greater than an actuation threshold, and to transfer charge to the dielectric layer upon such contact; and configuring the electrode and the movable reflective layer to be connected to additional MEMS devices of an array. - View Dependent Claims (18, 19)
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Specification