Current mode display driver circuit realization feature
First Claim
1. A device for modulating light, comprising:
- at least one light modulator comprising a movable optical element positionable in two or more positions, said modulator operating interferometrically to exhibit a different predetermined optical response in each of the two or more positions; and
control circuitry connected to said light modulator for controlling said interferometric modulator, wherein the control circuitry provides a substantially constant current to said light modulator to control said movable optical element.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention comprises devices and methods for driving a MEMs pixel, and in particular, an interferometric modulator pixel. In one embodiment a device for modulating light includes a light modulator including a movable optical element positionable in two or more positions, the modulator operating interferometrically to exhibit a different predetermined optical response in each of the two or more positions, and control circuitry connected to the light modulator for controlling said interferometric modulator, where the control circuitry is controllably switchable between two circuit configurations, and where the control circuitry provides current to said light modulator when switching between the two circuit configurations to cause the movable optical element of the light modulator to move between two positions of its two or more positions. In another embodiment a method of driving an interferometric modulator pixel with a driving circuit includes providing a potential difference across the interferometric pixel, wherein the provided potential difference increases over a period of time, and changing the position of a movable reflective layer of the interferometric pixel based on the provided potential difference.
-
Citations
25 Claims
-
1. A device for modulating light, comprising:
-
at least one light modulator comprising a movable optical element positionable in two or more positions, said modulator operating interferometrically to exhibit a different predetermined optical response in each of the two or more positions; and
control circuitry connected to said light modulator for controlling said interferometric modulator, wherein the control circuitry provides a substantially constant current to said light modulator to control said movable optical element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of driving an interferometric modulator pixel with a driving circuit, the method comprising:
-
providing a potential difference across the interferometric pixel, wherein the provided potential difference increases over a period of time; and
changing the position of a movable reflective layer of the interferometric pixel based on the provided potential difference wherein providing a potential difference across the interferometric pixel comprises incrementally increasing the potential difference across the interferometric pixel by a predetermined amount, wherein the potential difference is increased in two or more increments. - View Dependent Claims (12, 13, 14)
-
-
15. A method of driving an interferometric modulator pixel with a substantially constant current source to produce different optical responses, the method comprising:
-
configuring a drive circuit in a first state so that a plurality of charge storing devices are charged by a voltage source and the plurality of charge storing devices do not provide a voltage across the interferometric modulator pixel; and
changing the configuration of the driving circuit to a second state in a series of incremental steps over a predetermined time, wherein each of the incremental steps comprises connecting one of the plurality of charge storing devices to the pixel such that it provides a voltage across the pixel. - View Dependent Claims (16)
-
-
17. A method of driving an interferometric modulator pixel with a substantially constant current source to produce different optical responses, the method comprising:
-
providing a substantially constant current source to drive the interferometric modulator pixel, said providing comprising connecting one of a plurality of charge storing devices in the driving circuit to provide a potential difference across the interferometric modulator pixel; and
repeating said switching step until all of the plurality of charge storing devices are connected in an electrical series connection with each other, and such that the plurality of charge storing devices provide a potential difference across the interferometric modulator pixel. - View Dependent Claims (18, 19)
-
-
20. A device for modulating light, comprising:
-
means for at least one light modulator comprising a movable optical element positionable in two or more positions, said modulator operating interferometrically to exhibit a different predetermined optical response in each of the two or more positions; and
means for control circuitry connected to said light modulator for controlling said interferometric modulator, wherein the control circuitry provides a substantially constant current to said light modulator to control said movable optical element.
-
-
21. A device for modulating light, comprising:
-
a display comprising at least one light modulator comprising a movable optical element positionable in two or more positions, said modulator operating interferometrically to exhibit a different predetermined optical response in each of the two or more positions;
control circuitry connected to said display for controlling said interferometric modulator, wherein the control circuitry provides a substantially constant current to said light modulator to control said movable optical element;
a processor that is in electrical communication with said display, said processor being configured to process image data; and
a memory device in electrical communication with said processor. - View Dependent Claims (22, 23, 24, 25)
-
Specification