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Systems and methods of hybrid calibration of bias current

  • US 10,410,579 B2
  • Filed: 07/20/2016
  • Issued: 09/10/2019
  • Est. Priority Date: 07/24/2015
  • Status: Active Grant
First Claim
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1. A system for providing biasing currents to pixels of an emissive display system, each pixel having a light-emitting device, the system comprising:

  • a plurality of current biasing elements external to said pixels;

    a plurality of current bias lines coupling said plurality of current biasing elements to said pixels; and

    a controller coupled to said current biasing elements for controlling a programming of said current biasing elements over a plurality of signal lines;

    wherein each current biasing element comprises;

    at least one current driving transistor coupled to a current bias line for providing a biasing current over the current bias line; and

    a storage capacitance for being programmed and for setting a magnitude of the biasing current provided by the at least one current driving transistor;

    wherein the controller'"'"'s controlling the programming of each current biasing element 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.

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