External compensation circuit and method, and display device

  • US 10,943,536 B2
  • Filed: 06/14/2019
  • Issued: 03/09/2021
  • Est. Priority Date: 08/31/2018
  • Status: Active Grant
First Claim
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1. An external compensation circuit, comprising:

  • a regulation sub-circuit, and a compensation sub-circuit;

    whereinthe regulation sub-circuit is connected to a reference current source, a current detection terminal of a pixel circuit, a first node and a second node respectively, and configured to regulate a potential at the first node and a potential at the second node according to a reference current provided by the reference current source, and configured to regulate the potential at the second node according to a collected driving current loaded to a light-emitting unit by the pixel circuit;

    the compensation sub-circuit is connected to the first node, the second node, and a data signal terminal of the pixel circuit respectively, and configured to calibrate a data signal to be input to the pixel circuit according to a potential difference between the first node and the second node, and input the calibrated data signal to the pixel circuit; and

    the regulation sub-circuit comprises;

    a current amplifying portion and a potential regulating portion;

    whereinthe current amplifying portion is connected to the reference current source, the current detection terminal of the pixel circuit, a third node and a fourth node respectively, and configured to amplify a collected current, and input the current that is amplified to the potential regulating portion through the third node and the fourth node, wherein the current is the reference current or the driving current; and

    the potential regulating portion is connected to the first node, the second node, the third node and the fourth node respectively, and configured to regulate the potential at the first node and the potential at the second node according to the reference current that is amplified, and regulate the potential at the second node according to the driving current that is amplified.

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