Method and system for ramp control of precharge voltage
First Claim
1. A method of controlling a precharge voltage for current driven matrix elements, the method comprising:
- driving, for a conduction period of time, a current to a matrix connection for conduction through an element connected to the matrix connection;
sensing change in a voltage of a path of the driven conduction period current during a portion of the conduction period; and
adjusting a precharge voltage based at least in part upon the sensed voltage change.
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Accused Products
Abstract
A method and system for controlling a voltage to precharge current-driven elements in a matrix, and a method of manufacturing apparatus therefor. Current is delivered to a matrix connection during a conduction period so that an enabled element will conduct a particular charge. During the conduction, changes or ramps in a voltage associated with the matrix connection indicate that the element has not achieved equilibrium voltage. The ramps are sensed and used to control a precharge voltage which is applied to the matrix connection prior to subsequent conduction periods, generally until the voltage begins at the equilibrium value and therefore does not change during the conduction period.
155 Citations
67 Claims
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1. A method of controlling a precharge voltage for current driven matrix elements, the method comprising:
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driving, for a conduction period of time, a current to a matrix connection for conduction through an element connected to the matrix connection;
sensing change in a voltage of a path of the driven conduction period current during a portion of the conduction period; and
adjusting a precharge voltage based at least in part upon the sensed voltage change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of manufacturing an apparatus that provides precharge voltage and conduction current to devices of a matrix, the method comprising:
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switchably connecting a conduction current driver circuit to a column connection for providing a conduction current thereto during a conduction period;
coupling, to the column connection, a voltage change sensing circuit configured to sense change during the conduction period of a conduction voltage related to a voltage of the first column connection;
connecting an output from the voltage change sensing circuit to a precharge voltage control circuit configured to provide a precharge control signal in response to the output from the voltage change sensing circuit; and
incorporating a precharge voltage output circuit configured to output a precharge voltage controlled at least in part by the precharge control signal. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method of controlling a precharge voltage for current driven matrix elements, the method comprising:
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controlling delivery of a current during a conduction period to a matrix connection for conduction by a matrix element;
detecting changes during the conduction period in a voltage derived from the matrix connection; and
controlling a precharge voltage in response to the detected changes in a voltage derived from the matrix connection. - View Dependent Claims (38)
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39. An apparatus for controlling a precharge voltage for use in a plurality of matrix elements, said apparatus comprising:
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a current source connectable to at least one of the plurality of matrix elements during a conduction period to provide a controlled current for conduction to the matrix element;
a sensing circuit coupled to the at least one matrix element and configured to sense a change in conduction voltage of the matrix element during a portion of the conduction period; and
an output circuit responsive to adjusting a precharge voltage based at least in part upon the sensed change in conduction voltage. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. An apparatus for driving current in devices of a matrix, comprising:
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a driver circuit connectable to a first terminal of a matrix element to provide a current thereto;
a sink circuit connectable to a second terminal of the matrix element to receive the current conducted by the matrix element;
a sensing circuit configured to sense change during a conduction period of a conduction voltage developed when the matrix element conducts at least a part of the current, and to generate a sensed voltage change signal; and
a precharge circuit configured to output, during a subsequent precharge period, a quantity of charge that varies in response to the sensed voltage change signal. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61)
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62. An apparatus for controlling a precharge voltage for current driven matrix elements, comprising:
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means for providing a current to a matrix connection during a conduction period;
means for sensing a change during the conduction period in a voltage associated with the matrix connection; and
means for adjusting a precharge output voltage in response to conduction period voltage change sensed by the sensing means. - View Dependent Claims (63, 64, 65, 66, 67)
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Specification