Method for periodic element voltage sensing to control precharge
AssigneeClare Micronix Integrated Systems, Inc.
InventorRobert LeChevalier
Life of this patent
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Abstract
A method to determine and apply a voltage to precharge current-driven elements in a matrix. During ordinary scan cycles, a conduction voltage is sensed while the elements conduct a selected current. While not conducting the selected current, the sensed conduction voltage is averaged with other conduction voltages, and based on the averaged voltage a precharge voltage is provided during a precharge period of the scan cycle.
Claims26
A method of precharging elements in a display, comprising;
- sampling a plurality of conduction voltage on an element;
- storing a plurality of conduction voltage samples;
- determining a precharge voltage based at least in part on an average of any of said plurality of sampled conduction voltages;
- and
- applying the precharge voltage to the element.
A method of determining a precharge voltage for current-driven device elements in a matrix, the method comprising:
- applying a previous precharge voltage to an element during a precharge period of a scan cycle;
- driving a selected current through the element from a current source during a current conduction period of the scan cycle;
- sampling a conduction voltage during the current conduction period of the scan cycle;
- and
- determining a subsequent precharge voltage based at least in part on the average of said sampled conduction voltage and at least in part on at least the previous precharge voltage.
A method of precharging elements in a display, comprising:
- sampling a plurality of conduction voltages on a column of the display during a portion of a conduction period where one of a plurality of elements from the column is driven with a selected current;
- storing a plurality of conduction voltage samples;
- determining a precharge voltage based at least in part on the average of said sampled conduction voltage and at least in part on at least the previous precharge voltage,
- applying the precharge voltage to the column during a precharge period exclusive of the conduction period.
A method of providing a precharge voltage for a display, comprising:
- electrically connecting a voltages from a plurality of display element to a sample input of a sampling device;
- sampling the plurality of voltage at the sample input to produce a sampled voltage value;
- determining a subsequent precharge voltage based at least in part on the average of said sampled conduction voltage and at least in part on at least the previous precharge voltage,
- outputting the precharge voltage to an output.
Dependencies are inferred from the claim text.