Derivative sampled, fast settling time current driver
AssigneeRochester Institute of Technology
InventorsRobert J. Bowman, Chris J. Nassar
Life of this patent
Estimating the term…
Abstract
Methods for producing a remote current for driving a load, include one of sourcing and sinking a local current, Iref, through a distributed impedance line, at a first node thereof; the other of sourcing and sinking a remote current, Iref, through the distributed impedance line in response to the local current Iref; determining a rate change of voltage of the first node; and sourcing or sinking additional current, into or out of the first node, in response to the rate of change of voltage of the first node in order to settle the voltage on the distributed impedance line, and apparatus for providing such are disclosed.
Claims20
A current driver circuit, comprising:
- a local reference current circuit coupled to a first node at one end of a distributed impedance line and operable to produce a local current, Iref through the distributed impedance line;
- a derivative drive circuit operable to source current, or sink current, into or out of the first node in response to a rate of change of voltage of the first node;
- and
- a remote current drive circuit coupled to a second node at an opposite end of the distributed impedance line and operable to:
- (i) produce a remote current Iref through the distributed impedance line in response to the local current Iref, and (ii) minor the remote current Iref to produce a remote drive current Iref for driving a load.
A current driver circuit for an organic light emitting diode (OLED) array, comprising:
- a local reference current circuit coupled to a first node at one end of a column line of the OLED array and operable to produce a local current, Iref through the column line;
- a derivative drive circuit operable to source current, or sink current, into or out of the first node in response to a rate of change of voltage of the first node;
- and
- a remote current drive circuit coupled to a second node at an opposite end of the column line of the OLED array and operable to:
- (i) produce a remote current Iref through the column line in response to the local current Iref, and (ii) mirror the remote current Iref to produce a remote drive current Iref for driving an OLED at a given pixel of the OLED array.
A method of producing a remote current for driving a load, comprising:
- one of sourcing and sinking a local current, Iref, through a distributed impedance line, at a first node thereof;
- the other of sourcing and sinking a remote current, Iref, through the distributed impedance line in response to the local current Iref;
- determining a rate of change of voltage of the first node;
- and
- sourcing or sinking additional current, into or out of the first node, in response to the rate of change of voltage of the first node in order to settle the voltage on the distributed impedance line.
Dependencies are inferred from the claim text.