Systems, devices, and methods for driving an analog interferometric modulator
AssigneeQUALCOMM MEMS Technologies, Inc.
InventorsJae Hyeong Seo, Alok Govil, Ming-Hau Tung, Russel A. Martin
Life of this patent
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Abstract
Display elements of a display array include at least one fixed layer and a movable layer. The movable layer is positioned with respect to the at least one fixed layer by placing a charge on the movable layer and applying a voltage to the at least one fixed layer. The at least one fixed layer may be two layers positioned on either side of the movable layer. The movable layer may be positioned in a desired position when driving an array of display elements by executing a reset stage, a charging stage, and a bias stage.
Claims27
A method of writing image data to an electromechanical display element to place the electromechanical display element into a defined display state, the display element including at least one stationary electrode and a movable electrode, the method comprising:
- applying a first voltage to the at least one stationary electrode during a reset period;
- applying a second voltage to the at least one stationary electrode during a charging period following the reset period;
- applying a third voltage to the movable electrode during the charging period to charge the movable electrode with a charge Q defined at least in part by the third voltage;
- applying a fourth voltage different from the second voltage to the at least one stationary electrode during a bias period following the charging period;
- and
- electrically isolating the movable electrode during the bias period.
A display apparatus comprising:
- an array of electromechanical display elements, each electromechanical display element including at least one stationary electrode and a movable electrode;
- a driver circuit coupled to the array and configured to:
- apply a first voltage to the at least one stationary electrode during a reset period;
- apply a second voltage to the at least one stationary electrode during a charging period following the reset period;
- apply a third voltage to the movable electrode during the charging period to charge the movable electrode with a charge Q defined at least in part by the third voltage;
- apply a fourth voltage different from the second voltage to the at least one stationary electrode during a bias period following the charging period;
- and
- electrically isolate the movable electrode during the bias period.
A display apparatus comprising:
- an array of electromechanical display elements, each electromechanical display element including at least one stationary electrode and a movable electrode;
- means for applying resetting voltages to at least the at least one stationary electrode for resetting display elements of the array;
- means for applying charging voltages to the at least one stationary electrode and movable electrode for charging the movable electrodes of the display elements of the array;
- means for applying biasing voltages to at least the at least one stationary electrode different from the charging voltages applied to the at least one stationary electrode for setting display elements of the array to a defined display state.
Dependencies are inferred from the claim text.