Pixels and reference circuits and timing techniques
AssigneeIgnis Innovation Inc.
InventorsGholamreza Chaji, Yaser Azizi
Life of this patent
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Abstract
What is disclosed are systems and methods of compensation of images produced by active matrix light emitting diode device (AMOLED) and other emissive displays. Anomalies in luminance produced by pixel circuits and bias currents produced by current biasing circuits for driving current biased voltage programmed pixels are corrected through calibration and compensation while re-using existing data or other lines that can be controlled individually to perform said calibration and compensation.
Claims16
A system for generating currents for pixels of an emissive display system, each pixel having a light-emitting device, the system comprising:
- a plurality of pixels;
- a plurality of current generating circuits for providing a current for at least one respective pixel;
- and
- a controller coupled to said current generating circuits for controlling said current generating circuits over a plurality of signal lines;
- wherein each current generating circuit comprises:
- at least one driving transistor for providing the current for the pixel;
- and
- a storage capacitance for being programmed and for setting a magnitude of the current provided by the at least one driving transistor;
- wherein the controller's controlling each current generating circuit comprises:
- during a programming cycle charging the storage capacitance to a defined level;
- and
- subsequent to the programming cycle, during a calibration cycle, partially discharging the storage capacitance as a function of characteristics of the at least one driving transistor.
A method for generating currents for pixels of an emissive display system, each pixel having a light-emitting device, the system comprising a plurality of pixels, a plurality of current generating circuits for providing a current for at least one respective pixel, each current generating circuit comprising at least one driving transistor for providing the current for the pixel, and a storage capacitance for being programmed and for setting a magnitude of the current provided by the at least one driving transistor, the method comprising:
- controlling each current generating circuit over a plurality of lines comprising:
- charging the storage capacitance to a defined level during a programming cycle;
- and
- subsequent to the programming cycle, during a calibration cycle, partially discharging the storage capacitance as a function of characteristics of the at least one driving transistor.
Dependencies are inferred from the claim text.