Ramp control boost current method

A method of manufacturing an apparatus for driving current in devices of a matrix, comprising:

• switchably connecting a drive circuit to a first output terminal to provide a conduction current thereto;
• configuring a sensing circuit to sense a change during a conduction period of a voltage derived from the first output terminal and to generate a voltage signal;
• and
• providing a precharge circuit configured to output, during a subsequent precharge period, a quantity of charge which varies in response to the voltage signal.

A method of adapting precharge currents delivered to matrix element drive lines, the method comprising:

• selecting an element for sampling;
• applying a precharge current to the selected element during a precharge period of a scan cycle;
• driving a selected current to a connection to the selected element during an exposure period of the scan cycle;
• sampling a change in a conduction voltage during the exposure period of the scan cycle;
• and
• basing subsequent precharge current for application to a matrix element drive line at least in part upon the sampled conduction voltage change.

A method of adaptively controlling a quantity of electrical charge provided to a matrix connection during precharge periods, the method comprising:

• driving a current to a matrix element connection during an exposure period;
• sensing changes in a current conduction path voltage during the exposure period;
• and
• adjusting, based at least in part upon the sensed voltage changes, a quantity of charge to be delivered to precharge each of one or more matrix connections during a subsequent precharge period.

A device configured to control a pre-exposure charge quantity provided to matrix elements during precharge periods, comprising:

• means for driving a current to a first matrix element for a first exposure conduction period of time;
• means for sensing voltage changes, during a portion of the first conduction period, in a voltage of a path of the driven conduction period current;
• and
• means for adjusting, based at least in part upon the changes sensed by the means for sensing voltage changes, a quantity of charge to be delivered during a subsequent precharge period to precharge a second matrix element.

An apparatus for driving current in matrix elements of a matrix, comprising:

• a conduction current driver circuit connectable to a first terminal of a matrix element so as to provide a current thereto;
• a circuit connectable to a second terminal of the matrix element so as to accept 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 part of the conduction current, and configured to generate a sensed voltage change output signal;
• and
• a precharge circuit configured to output, during a subsequent precharge period, a quantity of charge which varies in response to the sensed voltage change output signal.

An apparatus for controlling current drive to display elements, comprising:

• a current source configured to provide currents to a selected display element during exposure periods;
• a sampling circuit configured to obtain samples of exposure period voltage changes for a conduction path of the exposure current;
• and
• a control circuit configured to change a precharge current level based at least in part upon the exposure period voltage change samples.

An apparatus for driving current in devices of a matrix, comprising:

• at least one exposure current source configured to drive a conduction current to a matrix element during a conduction period;
• at least one sensing circuitry configured to sense changes in a voltage during the conduction period while the matrix element conducts part of the conduction current;
• and
• at least one precharge current source coupled to a control signal from the sensing circuitry and configured to output, during a precharge period, a quantity of charge which varies in response to the control signal.